djvu | 66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a

Analysis

max time kernel
145s
max time network
124s
platform
windows11-21h2_x64
resource
win11-20240412-en
resource tags

arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
submitted
25/04/2024, 20:10

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General

Target
66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
Size 750KB
Sample240425-yxncesea9t
SHA256 66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a
MD5 058115e4c01b6b9604e99ddde61721df
SHA1 a2f58001d90f6b97ea03febb5136487565eee2ee
SHA512 7aa12cd84d57695e7b41ade8ebffdb5d01e99903f843f4f64e9b3e56323d9e55782874b86a0321df36dcdfc4bd382f54cfd94920c9b5efb4e57fe96e8556f898
SSDEEP 12288:WdO8ejKSRqHNAl2poCzWmpu2onEhrTKTmRFVWKSDKnGau+5aFtFYXaRXt2Bz:WExToKl2p1Jc2WSCTmzVWUxuuaF8Et2
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://cajgtus.com/test1/get.php

Attributes

extension
.bgjs
offline_id
Z6iwSvCoAt8T8K2ROxecuXHPNHv7eDyWrc8Ks7t1
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/54cdfd152fe98eedb628a1f4ddb7076420240421150208/403a27 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: 0863PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/2844-2-0x0000000004C60000-0x0000000004D7B000-memory.dmp	family_djvu
behavioral2/memory/4344-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-30-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1860-39-0x0000000000400000-0x0000000000537000-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
3828	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-1-5-21-2718508534-2116753757-2794822388-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\40d14323-a106-47bb-ba1c-d1fe7194344a\\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe\" --AutoStart"	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.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 2844 set thread context of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 1460 set thread context of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.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
4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
1860	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
1860	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 2844 wrote to memory of 4344	2844	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	81
PID 4344 wrote to memory of 3828	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	82
PID 4344 wrote to memory of 3828	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	82
PID 4344 wrote to memory of 3828	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	82
PID 4344 wrote to memory of 1460	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	83
PID 4344 wrote to memory of 1460	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	83
PID 4344 wrote to memory of 1460	4344	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	83
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86
PID 1460 wrote to memory of 1860	1460	66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe	86

C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
"C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2844
- C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
  "C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4344
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\40d14323-a106-47bb-ba1c-d1fe7194344a" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3828
- - C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
    "C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1460
  - - C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
      "C:\Users\Admin\AppData\Local\Temp\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1860

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 4e3ee32076baf8538d9b9473169229647c419aa92f4bef71fb12fb714ac4e77d
MD5 4ec20346a7b5dd75cfde7b15df208cf0
SHA1 517b437fc42dfc6e2f0d055dc678a0c080d47a0b
SHA512 dff871a49c68eebb57eb5d21c197c5f47adc2444edde5f9da25c35a91519747cdb07aae26adfebcf0e48409f45ed8e040ec1c777910942aa7c18268bc6bcd7d1
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 5e90640275e9851af5f1e49e7573692d7060849af6284f9e157dc588eaa3c81b
MD5 6e992fe3c43bad1d7778ade227ddea8b
SHA1 6fe94461609cafe1c2ffd3610a332c9bccbf1907
SHA512 9249954f9c14a901934f0990a28ebc2eaba8d314827a74ea61ebd3c1319a8663982fb3d679617d7e9899332204574f79520e5d50a5e69f520269b5e81bc1c9d6
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 572fc8c09762a90566d0f7953fc9f39ab9040a5848a93b771de315069776303a
MD5 6208e5e0e103c41785307ce591c6ef69
SHA1 75edf591a913b23f2f4850284e3c6f48ef8256fc
SHA512 e88ab76505a7c4bed5aed0c597454cfb3c5450574d9b636b98f76c598a319b04efed2748a0c981d83c623f7bc11e0f1bc593bfa87552b6abe12cead2186d670e
MD5 SHA1 SHA512

Submit Download

66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe

Path C:\Users\Admin\AppData\Local\40d14323-a106-47bb-ba1c-d1fe7194344a\66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a.exe
Size 750KB
SHA256 66b5e23671a48754833b3d4f6ee1ca360b6bbd164e4fa58b632c6d1d64e3fd9a
MD5 058115e4c01b6b9604e99ddde61721df
SHA1 a2f58001d90f6b97ea03febb5136487565eee2ee
SHA512 7aa12cd84d57695e7b41ade8ebffdb5d01e99903f843f4f64e9b3e56323d9e55782874b86a0321df36dcdfc4bd382f54cfd94920c9b5efb4e57fe96e8556f898
SSDEEP 12288:WdO8ejKSRqHNAl2poCzWmpu2onEhrTKTmRFVWKSDKnGau+5aFtFYXaRXt2Bz:WExToKl2p1Jc2WSCTmzVWUxuuaF8Et2
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1460-20-0x0000000003270000-0x000000000330B000-memory.dmp

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memory/1860-30-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-39-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-23-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-24-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-38-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1860-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2844-2-0x0000000004C60000-0x0000000004D7B000-memory.dmp

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memory/2844-1-0x0000000003270000-0x0000000003310000-memory.dmp

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memory/4344-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4344-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4344-17-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4344-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4344-5-0x0000000000400000-0x0000000000537000-memory.dmp

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