djvu | 73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9

Analysis

max time kernel
142s
max time network
130s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
07/05/2024, 12:43

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General

Target
73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
Size 765KB
Sample240507-pydd6sah24
SHA256 73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9
MD5 521670654b4bbf2d1b39aa80bd4bfaf5
SHA1 b42545c12b6861320f7cedbe475ef1875bcf2ce8
SHA512 6fad4ff5b98244078dde884f2ae8e76d31e3ad2702a8b8e1db91d83cc2d623a8c89e681b16eb4a7f94237a12f1f131882471e33e73be98df15783afdd6643471
SSDEEP 12288:/ZNEQcVk4HiDk/he1WrRx51Aea2ZS5rZW3WDwzmymN6fc4lO+vuPpqwNz2:/nERi4CY/c8rl6ePkpZBeET+vy4qz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.qehu
offline_id
jgILOjDrBgyzY4JmT3B2jDSyBmDPBruKk8bKs6t1
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/665ddae3fc3cd10bbaaa4350408b196920240504141005/4cae7e 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: 0868PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 15 IoCs

resource	yara_rule
behavioral2/memory/4348-2-0x0000000004940000-0x0000000004A5B000-memory.dmp	family_djvu
behavioral2/memory/2452-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2452-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3916-37-0x0000000000400000-0x0000000000537000-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
2240	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-1-5-21-3062789476-783164490-2318012559-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\dc6f9ef9-2e7e-4c11-9ae7-7dd9ae38dd9f\\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe\" --AutoStart"	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.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
8	api.2ip.ua
1	api.2ip.ua
2	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4348 set thread context of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 1448 set thread context of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86

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
2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
3916	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
3916	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 4348 wrote to memory of 2452	4348	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	81
PID 2452 wrote to memory of 2240	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	82
PID 2452 wrote to memory of 2240	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	82
PID 2452 wrote to memory of 2240	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	82
PID 2452 wrote to memory of 1448	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	83
PID 2452 wrote to memory of 1448	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	83
PID 2452 wrote to memory of 1448	2452	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	83
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86
PID 1448 wrote to memory of 3916	1448	73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe	86

C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
"C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4348
- C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
  "C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2452
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\dc6f9ef9-2e7e-4c11-9ae7-7dd9ae38dd9f" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2240
- - C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
    "C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1448
  - - C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
      "C:\Users\Admin\AppData\Local\Temp\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:3916

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 20b6e820f80d6e85ed693c25d89059dce8eca4be24fbb2393c5c7c2fc409ab74
MD5 648c85839e7254a2fbc93f592bb7447f
SHA1 55cdd89cd957f4fd1969358ea24f6d68623faa36
SHA512 426874318871dc8f1011739836380ccc9fed292cffc4688a9eed74d2a3c6e0265c148c093db31945f8e73ebe8aed43ab2b0f936d3ed2bf76adcdae17e8c716e7
MD5 SHA1 SHA512

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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

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24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 410B
SHA256 55ca65b360a006f9021061029fda06d3b5789675a5dd32febf77d63ce1b44a33
MD5 d99c2df7bf606aafd168a412883e32c0
SHA1 6d4a135584ff7b0c4664eb9d9ce63d9bd4fc5f97
SHA512 5e0cb051c7e25285c70ed6b645e0c60b5b6c6af6b39ad38f6e1bc5ff2ca46daf7be9fce2ef1eb3f2bab4b9afbd7538a7b00afe0023b6f8a3521bda4cf9bf6833
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 bf222d654c84891ca05d093e638a4b2cf2d8d2e501b7a69c6e5d0fb6cbd13d34
MD5 647d28608e899298e4004ab90811ae26
SHA1 c5bceaae329042b0298193b456644f80af593d99
SHA512 78eb9f16863dab8ed6b50e9b154ea4d4175838e251046f9d84e29f5e8fafb41fddee1a028089ad9046f6f4033a6c7e6799d38d2e8e0398d890d9052bdf5d2494
MD5 SHA1 SHA512

Submit Download

73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe

Path C:\Users\Admin\AppData\Local\dc6f9ef9-2e7e-4c11-9ae7-7dd9ae38dd9f\73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9.exe
Size 765KB
SHA256 73d4fb8ca8474c37ecd52e49aee1a848967d25a3170481f170646b98455b77a9
MD5 521670654b4bbf2d1b39aa80bd4bfaf5
SHA1 b42545c12b6861320f7cedbe475ef1875bcf2ce8
SHA512 6fad4ff5b98244078dde884f2ae8e76d31e3ad2702a8b8e1db91d83cc2d623a8c89e681b16eb4a7f94237a12f1f131882471e33e73be98df15783afdd6643471
SSDEEP 12288:/ZNEQcVk4HiDk/he1WrRx51Aea2ZS5rZW3WDwzmymN6fc4lO+vuPpqwNz2:/nERi4CY/c8rl6ePkpZBeET+vy4qz
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2452-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2452-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2452-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2452-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2452-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3916-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4348-2-0x0000000004940000-0x0000000004A5B000-memory.dmp

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memory/4348-1-0x0000000002E80000-0x0000000002F13000-memory.dmp

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