Analysis of recent variant of Crysis/Dharma ransomware

Contents of the analysis

Overview
Infection (Static+ Dynamic)
Encryption
Threat Indicators
Forensics Investigation (data recovery)
Conclusion


     OVERVIEW
Dharma ransomware aka Crysis ransomware was first reported in the campaigns of 2016 and 2017. Even today, it evolved and released a new variant and spotted in the wild. We found the recent sample during a threat hunting activity and let’s see the analysis of that latest sample in this article.

File Hash (MD5): BA67DD5AB7D6061704F2903573CEC303
File Size: 92.5 KB
        
                                       INFECTION
The delivery mechanism of Crysis ransomware is caused by manually infecting the victim PCs via Remote Desktop Protocol (RDP) access. The attacker prior to the infection, they brute forcing the Windows RDP protocol on port 3389. In case of weak or default credentials, the attacker will get the access to the victim machine and execute the Crysis ransomware.


Analysis of the Ransomware sample
The Ransomware file 1taskp.exe (md5: BA67DD5AB7D6061704F2903573CEC303) is custom packed based on the Entropy value as shown below.


Figure 1 Entropy value and packer detail
 The file contains only very few API functions such as GetProcAddress, LoadLibraryA in the import functions. The malware author has used the Dynamic API Calls to load the dll files and import the API functions. They encrypted the names of the required dll files and functions.


Figure 2 API details

Decryption loop
Ideally, this ransomware specimen must have a decryption loop and we spotted the below instruction sets which are doing the decryption works.


This decryption loop looking for data to be decrypted. The below data is fed as input for this decryption loop (Refer the below snapshot for the data as given as input to decryption loop).


After the Decryption loop, we can see the import functions of kernel32.dll which are going to get invoked through dynamic invocation. The file checks the function from the list of API Hash values for kernel32.dll

The above APIs are used by the sample to proceed the ransomware functionalities. Let’s see the behaviour of the sample.

Behavioural analysis
We executed the sample in control environment. It exhibits the behaviour of ransomware variants by encrypting the files and added file extension.


All the encrypted files are added with ‘.combo’ extension with the email id bitpandacom(at)qq(.)com followed by an id tag as ‘id-F0861AD0’.

To maintain the persistence, the malware creates run registry entry as follows:

Key: HKLM\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN
Value: 1TASKP.EXE
Physical location of the file: %WINDIR%\System32\1taskp.exe

The file creates a duplicate file in the system32 location which is added to the registry run entry.
Further, it deletes the shadow volume copies using “vssadmin delete shadows /all /quiet”.


                                                 Threat Indicator
IOC details:

File Hashes (MD5)
BA67DD5AB7D6061704F2903573CEC303

File extension added by this variant of ransomware:
‘.combo’ extension with the email id bitpandacom(at)qq(.)com followed by an id tag as ‘id-F0861AD0’


Registry entry added as:
HKLM\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN
Value: 1TASKP.EXE
Physical location of the file: %WINDIR%\System32\1taskp.exe


Files dropped in app data:
 % WINDIR % \System32 \ 1taskp.exe

We collected the hash details of the same variants in the following list:
SHA256
MD5
7724a6c8243c626f008d960c2d7912a11131f9318ec98e8d7983420a004b45ae
83db1ae5b68af8693e3bfe15e7f73e23
46a3838892e1f8ccbbaa07f2b24fbdb22ff3f6e5cb3b194d0bb3254568335541
a32e4d2699466c5a99242c1b6322a68b
44ebb3550c94dd00766ab125206827ab7bd35e532a04d7d7c88e7d74da0f07ac
1d84c5a06c3bd175c12d625bb5259237
6ff6037243dc68bd7183564d98257edfd7f1b87675eceada2bd809545280d17b
dec22084f515b2c145f9019143d860a3
00d290adbb184cb52ee6a6cae7c4a3b02edcda1f99acfadf1fbac11c44ed081e
0c2b066f9bb0ed1c3d68f0e13d5eb318
95db01ec6398fb556cc71ffd45bf1d916a1625cb96f67c37539fc1f5d704afb1
fa67049b7aad8fe8bbec301078ed9e15
02e055beeed3d56c1fd2d17e92d36312e4168774885e5f068edc45a3ddf1e39c
4cff9617b843e6859e908c068b7c2146
e64fd6baf57c5f0c151ef93caaf0a90324eacf72bf3cb9e3790d09849cec9275
5945e4e537e62e4edff15471169b6cd5
2a247b244687022fb6090c065355c40040494a2dec57c0d9180f948cf3acc8e7
3e682a53560a6694ee6bda65182a7e44
a249ac15d4f1fd063c0b335e649b4df7656e4e4ae93390761a28eb8c0f0bf95a
048f74e060126d93acc04674e64995ad
c7d8de88b30c72884e1479b5d750267d05c6736fd64bc1a2a75823d6f911c1ac
136f4190084e2d50edab15094dd9fb31
a43dab9c34af5a49a2a615e86db3e2bf4c5467853dd5bd4f1a1c73619b683ab2
6ed029b9794717d305103e9eb20a8d1f
73fe0716303ae868b78e4d380120d0c3ca0a87d6dea2ad2126fbbef1e56507ac
237e96c9cfc0a9658fe5858df7dde8e0
046af53654b1fb8e0d61515a2f660b6f985c0ccb86e278a227dbd732577e43b4
7d815928c8213da10001001d105cf5ba
fa5c8a038524da851671585b52326f00d1462974117a76a629c5b0ad50931ff8
d61b6a33e4ffe8a5477eaf36a1a19814
5cec86494711c0700e876922ad52c7aec3caabecd7a2577ce4a7f0cd40b0aa31
b443d5c04e420ad73636247c48894667
45babf993f443a7318517c147af4181bc6e2562f81b924686cc3e3c42b6ba4a6
0730fa733c939be1d68686fd1e17f451
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2db826610f232612e908e7c0454184e7
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2bbb2d9be1a993a8dfef0dd719c589a0
c2955c6ce87e18f5a45a51b94a1fb1d4e47197c5d1500b0e59a3e6613b20b0e6
e3decd65ee08bf1ab3ec0dd3b5bca71b
1634c748c870a0f770507956aefe1597daf8acb364f6bc1829d0da75235daf1b
1c1755d03fa70c9da84439d0d2bde9f7
2c9c4ff5089f5c80cc51a2c10b3cb88b75f58450eaa819502f3af6fb1490a5e0
47f6b6d1ab3f3b27175a724f39095ce4
3430e53a0a19e1a6442fc677146ea3a0b81fdd1cffc1363b0f4bb28bca339623
3fe685e43949e8faba76bd69d261ac75
153834ac3c6b67f479548e8069a1de8419764a18df200bd429eb77c062d1b36d
26bd8a37e289236f7f3508ae5969649c
b075ddb6ef76d0c09fe78b78d116a2733bd54980286e777e09f82c491c7af546
5bcad58742ab33a6a5bd9c9cab7ad515
87c9aa9af35120809ee1aece0774f04b548e9dec947c14e2f5361aadacf7ea74
1c72cd7310c7c05b82d76efea069fa7b
11b50c8a2156e0f3c31ddda3b68e51365f3660d2f8c3223b69bf8612f80dbceb
db8e7e08bfda9dc386b8b4941fef6ff1
2339d62696501ccfe1bb19d3770a854b8391860f1d2d99f037b883703edf2cf1
4dfe4688a2093c46c5b038965b30af89
9b21f9aa91d281a628fede6fa4ab5835bc979ac60861d20adb88e388a0f89a7a
a9477e3b31f86eac0424da995ffedba0
1dbcb082ba3d73c1521f61ffcd145706021ecd77fdf1872770cb7afaf665a080
fe7d8a022b4dd18b98cef610b8d355f4
51cc147e61829e14c8e0553dc9e64c14d91e5e5e753c9233e69e96b0f7642571
1526e038d35fe8f011b20210d57004c3
ea980c6e9ff2fc329035d7851755827758be51076f71d2d655d4bb4ecfc78f00
7db301bb46c75eaaf7e5930071d9a4a9
af6748905a340c81bebf09d5132d65f7712b4d8f581fc290b5b3639437e6eaf2
af52d0d65b5fac92d4f60e7ea7293b0d
34c47fc60a989ca969147b7d8137aa068ce547bddf424b9325c2aa2ad2bd819b
0dfddf70a6c5c202db2ee9ba018fc0a2
ac9cbd9a9abf6973590cb197f83ec1c1b0b19dc1bdc7a40695e1b7bce88d2fc4
6d85d51de947f12ad2a74ae7b92c7995
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673c287b59c80ea57e507e64782ddf44
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331d08a2baaa71f41ba232656a4b80a0
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48a417edacbb364f630212c337896189
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dfeebb7b595f63abc5c7ff3dda3d4ed0
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5fb1f01a8566b1489d8c82726fb3598e
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98b300cbc8c7a11af1f08bd3d0847f78
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324fad08ec1d63cd492c0725b03d72ff
c19507dcd2c9cd3cb2032d455562b2b5e98bd9d32401a34b193269cd47991270
d011920feb6ebd30657094d09ab8a419
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bb6e229ef6ca2448bc7d12d934b6f43c
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fd0138b38d3c0b25bab0294312e556c8
1e774891be7630d10b0310ef552207aa31d843baf59a19892f18221e73ca3cae
28fc7ea7c6e3bffa647b3ce9d96c2f5b
1d667f6523ab2b32dc07fe34ef259f0fcf49ecf5d56add50e0f62cc55ef94526
1b7158c58b648e8032f2e46b6f05747d
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3c5b06a8e03d78bcb217c42560f4c7f3
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2f231e546ff2a50fcff4b5196f663bbd5039e5887c189f34829dc6bf091dfdeb
3b075a659fe37098adcbc91693b03edf
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bb441579fce0981424e6a1dd437f5c95


                                   Conclusion
We recommend users to update their security patches with the latest update. User awareness on security basics will be helpful in combat this variant of ransomware. For threat hunting and precaution measures, we recommend blocking the hashes mentioned in the IOC section.



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