djvu | 1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af

Analysis

max time kernel
143s
max time network
125s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
04/05/2024, 16:57

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General

Target
1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
Size 826KB
Sample240504-vgj4aaeg66
SHA256 1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af
MD5 b0e7b0f70903c57ee27041efdfffbc12
SHA1 9b53e469911997e9a3fbfb1673060a2c83a84886
SHA512 5acd330c10f5d96a2bdc8211747ea44976dfd62dd2257e4ab8ad51c2049905e15bc561a23260345493b3c43438332baf4b2ab2de4f99fedb150a3962cf62f7e4
SSDEEP 12288:dnf840bmNPbpu2ksj4ei+GzzwLO8SN+39kluhFdRgMNX1LXHv0m9w4ugEp2sx:dE4ZP9u1eRozaQN29k03laLp2
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 17 IoCs

resource	yara_rule
behavioral2/memory/1964-2-0x00000000038A0000-0x00000000039BB000-memory.dmp	family_djvu
behavioral2/memory/236-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/236-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/236-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/236-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/236-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/424-41-0x0000000000400000-0x0000000000537000-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
2704	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-1-5-21-2994005945-4089876968-1367784197-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\a4f48118-fd25-4a0c-8d6f-054be895a647\\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe\" --AutoStart"	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.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 1964 set thread context of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 5112 set thread context of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87

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
236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
424	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
424	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 1964 wrote to memory of 236	1964	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	81
PID 236 wrote to memory of 2704	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	83
PID 236 wrote to memory of 2704	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	83
PID 236 wrote to memory of 2704	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	83
PID 236 wrote to memory of 5112	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	84
PID 236 wrote to memory of 5112	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	84
PID 236 wrote to memory of 5112	236	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	84
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87
PID 5112 wrote to memory of 424	5112	1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe	87

C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
"C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1964
- C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
  "C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:236
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\a4f48118-fd25-4a0c-8d6f-054be895a647" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2704
- - C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
    "C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:5112
  - - C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
      "C:\Users\Admin\AppData\Local\Temp\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:424

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 0565d893994abf11978d4e14fa4a1b900ce76d64cf5aca5dc1b93ac36d7939ee
MD5 07ee23ba0a6d65486c02777656134226
SHA1 1afd41e6d40db17cc7c1131f2191f8cd5eacdc69
SHA512 45c4aebbfea8a9ad74a3c214d71bc903d09c643c08431b552ee2ad6c1c258a6a013bdcdadbccfd62f2045761ff67c851729dc139063cd5ab6d09ba6f378362fa
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 b84978776575e578ac1f2d353e7b4056cd5d8b331868e81e612ac8da38e0bd1b
MD5 ae2ef01ead490e5f5fd1e7e4ed7a12c9
SHA1 da393d8f6e67fb4f8df39548e26c83b56368fe8c
SHA512 d16b4eb79ee6443bbaeee4cb755040a539f1a0dc1b61aeb99274183d33a3c0074412a343895035a9b7afe683f88f0702394b9639e0acc256c7ae16f896e3ce54
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 c4b906271092f56abb32341bbe1f168a647b5dacf68a7dba40bc3cda8aac4d74
MD5 b8965666e2b85e1cd22571f33c427b3a
SHA1 1b50504f88a83f05e9776e375ca31b3789e6d7ae
SHA512 c9a081308eb0b56ada8902bedf2cc83b4e4ca9096c25eac179349d5c08d623dc7771d538680fdbec692f191b8ad137569e29487e9f920cca8f02f53bc07443d5
MD5 SHA1 SHA512

Submit Download

1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe

Path C:\Users\Admin\AppData\Local\a4f48118-fd25-4a0c-8d6f-054be895a647\1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af.exe
Size 826KB
SHA256 1b361d25d757a4f4a3ee0d043783d2a3d8635fc5e79fb413d3d87a7b1cb742af
MD5 b0e7b0f70903c57ee27041efdfffbc12
SHA1 9b53e469911997e9a3fbfb1673060a2c83a84886
SHA512 5acd330c10f5d96a2bdc8211747ea44976dfd62dd2257e4ab8ad51c2049905e15bc561a23260345493b3c43438332baf4b2ab2de4f99fedb150a3962cf62f7e4
SSDEEP 12288:dnf840bmNPbpu2ksj4ei+GzzwLO8SN+39kluhFdRgMNX1LXHv0m9w4ugEp2sx:dE4ZP9u1eRozaQN29k03laLp2
MD5 SHA1 SHA512 SSDEEP

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memory/236-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/236-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/236-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/236-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/236-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-30-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-25-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-23-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-41-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-40-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-38-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/424-39-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1964-2-0x00000000038A0000-0x00000000039BB000-memory.dmp

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memory/1964-1-0x0000000003800000-0x000000000389B000-memory.dmp

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memory/5112-34-0x0000000000400000-0x0000000001A98000-memory.dmp

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memory/5112-24-0x0000000000400000-0x0000000001A98000-memory.dmp

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