djvu | 51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655

Analysis

max time kernel
144s
max time network
124s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
27/05/2024, 01:20

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General

Target
51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
Size 785KB
Sample240527-bp7prsca98
SHA256 51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655
MD5 728b56bc0ce574d37bccfecefc09d8ea
SHA1 09e5de4b619d9c04e2c53d901d710a77d760c44c
SHA512 77fa7de1c49f045e7b98f2232a923c3b9d625560fb7e8dcf5a8823b5f5638200e0a00e9f9a1b98719b099663f6a70d2d432d48945e1e657cc120fe57af41c702
SSDEEP 24576:khYUy9vJsbejRnN2L2loqcyj9bdAUrV6:edy92SN2R7YX
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/2744-2-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/644-4-0x0000000004AD0000-0x0000000004BEB000-memory.dmp	family_djvu
behavioral2/memory/2744-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2744-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2744-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2744-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-37-0x0000000000400000-0x0000000000537000-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
3188	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-1-5-21-2551177587-3778486488-1329702901-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\bf0b3d19-230d-4e73-8ca6-ab51cce203b7\\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe\" --AutoStart"	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.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
1	api.2ip.ua
2	api.2ip.ua
8	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 644 set thread context of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 3540 set thread context of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83

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
2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
4480	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
4480	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 644 wrote to memory of 2744	644	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	78
PID 2744 wrote to memory of 3188	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	79
PID 2744 wrote to memory of 3188	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	79
PID 2744 wrote to memory of 3188	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	79
PID 2744 wrote to memory of 3540	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	80
PID 2744 wrote to memory of 3540	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	80
PID 2744 wrote to memory of 3540	2744	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	80
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83
PID 3540 wrote to memory of 4480	3540	51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe	83

C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
"C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:644
- C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
  "C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2744
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\bf0b3d19-230d-4e73-8ca6-ab51cce203b7" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3188
- - C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
    "C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3540
  - - C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
      "C:\Users\Admin\AppData\Local\Temp\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:4480

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 429412943115645502abfc1e90de01f05cdaa465b794622eb219bece495760b3
MD5 619e0289640d6c5c4b2a6cd1a2029297
SHA1 d01efa5d51791af317b72ad548d2f5e63cf26e04
SHA512 3caa45448c44aa009f647cf3b8ac1bbe1add4a1a1e0faeebf47d56aca67dd81a5c3a9470fed1075e92b939fa66af1b4b8e71306331dc7846fb30a792bfd2eefc
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

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24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 410B
SHA256 14105e087dba4c6079519c49e87cde1d4bbf31af86ff421b9eb5f4bd9a1095c3
MD5 4bcc66d0924845c7fa63552e6799d750
SHA1 436de519ba1b68f7375c4eba8ea2568fb2b6c42c
SHA512 5bbb8de3c6a0d5ae4fb6525cd20b6bce647689606ca794e9279c46d88aa6b20c38bb34bf1bddf3c749dee84b60a6ef74e925ff4881274a11fe8a71996156b80d
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 f64616e4d8cd438db8a741c86d18f961b5e7d0588e0c841042c982688d5c4e4c
MD5 7d7e92ffea32ead304698618680ad64b
SHA1 6dea51cf7447264f383e379b6eeebb9526597f9c
SHA512 4c791b33b39e559208aee4f6f7e789d50269320907d97a631c5d8b2369a55b46e72bf1f63747bcead4de6641ba79b7d4e76d04d42f9ea56056440274085e3a5e
MD5 SHA1 SHA512

Submit Download

51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe

Path C:\Users\Admin\AppData\Local\bf0b3d19-230d-4e73-8ca6-ab51cce203b7\51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655.exe
Size 785KB
SHA256 51ae779ec9fff88948d64d66b0d5e8e65d2443bf8f17914a0d6377c8b05be655
MD5 728b56bc0ce574d37bccfecefc09d8ea
SHA1 09e5de4b619d9c04e2c53d901d710a77d760c44c
SHA512 77fa7de1c49f045e7b98f2232a923c3b9d625560fb7e8dcf5a8823b5f5638200e0a00e9f9a1b98719b099663f6a70d2d432d48945e1e657cc120fe57af41c702
SSDEEP 24576:khYUy9vJsbejRnN2L2loqcyj9bdAUrV6:edy92SN2R7YX
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/644-4-0x0000000004AD0000-0x0000000004BEB000-memory.dmp

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memory/644-1-0x0000000004A30000-0x0000000004AC9000-memory.dmp

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memory/2744-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2744-2-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2744-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2744-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2744-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-37-0x0000000000400000-0x0000000000537000-memory.dmp

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