djvu | 6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad

Analysis

max time kernel
144s
max time network
128s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
25/05/2024, 16:10

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General

Target
6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
Size 731KB
Sample240525-tmvljaae82
SHA256 6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad
MD5 600670df1cc5b3de65c32d0d4d9752c0
SHA1 e31c8a78555d11fdc994381c5855faf7d0745397
SHA512 8f2b5d0796d63c6ac540e342d1663d1af4ab3a6381bd88e2fd3c7c75e305214ff3c98e47089fc104c3c68b29388e16d48278366a3da3545d8317eb1abc2128b2
SSDEEP 12288:SKxjU05PZERySDZXTnvEebBtMJUNCVwM/Cr6fWLApvRPWYvKPZXS+Sh9M:pxleggGJqlM/CruW8pJOISD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://cajgtus.com/test2/get.php

Attributes

extension
.vehu
offline_id
EGfa5svnSGFJka7LZBQoqff0QtO1IpTauoDvGvt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://cajgtus.com/files/1/build3.exe
ransomnote
ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://wetransfer.com/downloads/33b490a613f49fa190924f199d2c079e20240512191214/caaf73 Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0872PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral2/memory/1560-2-0x0000000004B10000-0x0000000004C2B000-memory.dmp	family_djvu
behavioral2/memory/2204-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2204-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2204-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2204-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2204-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3900-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2216	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3001105534-2705918504-2956618779-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\cd73c6c3-9f7a-41bd-947d-be1c28575260\\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe\" --AutoStart"	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	api.2ip.ua
8	api.2ip.ua
1	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1560 set thread context of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 3436 set thread context of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
3900	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
3900	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 1560 wrote to memory of 2204	1560	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	80
PID 2204 wrote to memory of 2216	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	81
PID 2204 wrote to memory of 2216	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	81
PID 2204 wrote to memory of 2216	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	81
PID 2204 wrote to memory of 3436	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	82
PID 2204 wrote to memory of 3436	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	82
PID 2204 wrote to memory of 3436	2204	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	82
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85
PID 3436 wrote to memory of 3900	3436	6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe	85

C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
"C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1560
- C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
  "C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2204
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\cd73c6c3-9f7a-41bd-947d-be1c28575260" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2216
- - C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
    "C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3436
  - - C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
      "C:\Users\Admin\AppData\Local\Temp\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:3900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 1KB
SHA256 a8400cc21263f2c44ccb301a3a1ef66a1ff009fd4d301362fd778e7b23a386d8
MD5 8df6dedd4dd10eb8211463f82b129e29
SHA1 ffc6e51cf829b481d789d8e3e61f6c7096fbde3e
SHA512 25fd6d8684ff8db3d40a8fe33267fd01d6456a84f81c7e579f7508c36558cf731a0ec8a2999a539aa5c1985dc45f7bd20d2a14a343b2326030941858f24c57f4
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 724B
SHA256 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
MD5 8202a1cd02e7d69597995cabbe881a12
SHA1 8858d9d934b7aa9330ee73de6c476acf19929ff6
SHA512 97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9
MD5 SHA1 SHA512

Submit Download

24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 410B
SHA256 a13e1f9393ea273a9fbe3f122116ae6496fcac1831dbbd1cbeeb61b4b48ae468
MD5 11269f21ef0caf7089936e4ad6b4b940
SHA1 d6ad3e5569f5cd25eb1946259e46109a59691e96
SHA512 59876950af69718c8ab065bbb1b4e52d2f384dd3fdbdf148a35a621c0fd57ed6a07cc5475fa8fcc24652ce0de8acefeaad2877fdf3847e53770fd3f5386abdb7
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 3d57c269f7ad04529f2134958d2c137766c1b78c9295bf0d13062656fc49cef0
MD5 56ec7f6d1e5f98b69b0539fba1aa5926
SHA1 e2460aeaff1fb854feda9174d590b8bbde5f480f
SHA512 94f29763e4ac0664cdbcd52a679842e60967c6d2cfe8a5bbc6e6dfb0ec05fca7c573234caf643f7ad6f795d5d5937c85f90efee767a6012d1e04eb4d00a9367b
MD5 SHA1 SHA512

Submit Download

6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe

Path C:\Users\Admin\AppData\Local\cd73c6c3-9f7a-41bd-947d-be1c28575260\6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad.exe
Size 731KB
SHA256 6a7c5af252c1f6e52b1714fd568247582f4e40a8683bd1ba2c9f370a7b4380ad
MD5 600670df1cc5b3de65c32d0d4d9752c0
SHA1 e31c8a78555d11fdc994381c5855faf7d0745397
SHA512 8f2b5d0796d63c6ac540e342d1663d1af4ab3a6381bd88e2fd3c7c75e305214ff3c98e47089fc104c3c68b29388e16d48278366a3da3545d8317eb1abc2128b2
SSDEEP 12288:SKxjU05PZERySDZXTnvEebBtMJUNCVwM/Cr6fWLApvRPWYvKPZXS+Sh9M:pxleggGJqlM/CruW8pJOISD
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1560-1-0x0000000004A70000-0x0000000004B06000-memory.dmp

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memory/1560-2-0x0000000004B10000-0x0000000004C2B000-memory.dmp

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memory/2204-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2204-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2204-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2204-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2204-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3900-37-0x0000000000400000-0x0000000000537000-memory.dmp

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