djvu | 645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012

Analysis

max time kernel
143s
max time network
123s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
22/05/2024, 10:01

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General

Target
645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
Size 702KB
Sample240522-l2ff6abc46
SHA256 645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012
MD5 dd1cb88ac4542fea3c32b4ff7c60483e
SHA1 b4b716636014911d002c72ca8e35fb90c7074b76
SHA512 df9929a028576507fbf9307a723877eee25463868499c10d3b2c45defd665331f2425e96a6ad2035f7baa6a0c2fe3a75830d56a9bfc8ae44f1e846043d9f12f1
SSDEEP 12288:WRuDXAgdLFderRBGPHzyoqJnG7suDKkrq3Daa1qG7GXiLSG4Bfp5C:WREdLXRPGBJG7Rekrq32awCSiLSPV
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/5048-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/5100-5-0x0000000004B60000-0x0000000004C7B000-memory.dmp	family_djvu
behavioral2/memory/5048-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/5048-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/5048-2-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/5048-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1364-37-0x0000000000400000-0x0000000000537000-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
2992	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-1-5-21-3433428765-2473475212-4279855560-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\e79973e8-e286-4d03-b4a9-962f6e104a95\\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe\" --AutoStart"	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.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
7	api.2ip.ua
1	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5100 set thread context of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 104 set thread context of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.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
5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
1364	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
1364	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5100 wrote to memory of 5048	5100	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	81
PID 5048 wrote to memory of 2992	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	82
PID 5048 wrote to memory of 2992	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	82
PID 5048 wrote to memory of 2992	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	82
PID 5048 wrote to memory of 104	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	83
PID 5048 wrote to memory of 104	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	83
PID 5048 wrote to memory of 104	5048	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	83
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86
PID 104 wrote to memory of 1364	104	645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe	86

C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
"C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5100
- C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
  "C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:5048
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\e79973e8-e286-4d03-b4a9-962f6e104a95" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2992
- - C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
    "C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:104
  - - C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
      "C:\Users\Admin\AppData\Local\Temp\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1364

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 5c2e51ccf5767f80257a0a0bb66dee40957e5379431e15a118e7f1343ad1f6e0
MD5 195fc28150bef9b30510eed36fb325af
SHA1 1ea8a314d8af1d431b77d5280d1782e9a8e867c6
SHA512 537da7e46d8b5afc796c1908042088c583c5380fb729f3665845fe36286b3efeaec9fa26475e9c2263f55b1eca04bd7ae26088a9a85950b2b7f750fd24eadcfc
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 e0a4a861ec64fe9a3cdd73b2ff7bcdf626e4a965ee22d39a31721b80702d9898
MD5 133d62f51f9606e085206c87e3c2c095
SHA1 bf3e8aedb2f92b12055730cd544cc4ebe79b45f8
SHA512 f8c28a01bf141a43da0b7d0192b27762ddf2ba183fcde5d9f2eb34d96bfdd8046adc1d63211a878b210c1e7abd1f4b3484aa043312b28835dccafc61fbfc8f9b
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 61c2803fd69a3da8d7747c71fbf9fbd6c1d1b34a1b7b8ae5fd77c65ca8de64b9
MD5 b464283a9104c250b476065b838d6e92
SHA1 e6e224b83f022df7eb31dc01d4a7bf3a6506b029
SHA512 e09b5056794018eb4d48e43512c724796b96c0ae028686d6f16db7546f230a9f2294ecef035c37a096dc97695f273dc5f4347d8c0ad9a624b8557427b537b3cb
MD5 SHA1 SHA512

Submit Download

645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe

Path C:\Users\Admin\AppData\Local\e79973e8-e286-4d03-b4a9-962f6e104a95\645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012.exe
Size 702KB
SHA256 645bc13bf5dfefb2f0d2412363f424439f266989a5eba19abe6a2d98a7e2c012
MD5 dd1cb88ac4542fea3c32b4ff7c60483e
SHA1 b4b716636014911d002c72ca8e35fb90c7074b76
SHA512 df9929a028576507fbf9307a723877eee25463868499c10d3b2c45defd665331f2425e96a6ad2035f7baa6a0c2fe3a75830d56a9bfc8ae44f1e846043d9f12f1
SSDEEP 12288:WRuDXAgdLFderRBGPHzyoqJnG7suDKkrq3Daa1qG7GXiLSG4Bfp5C:WREdLXRPGBJG7Rekrq32awCSiLSPV
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1364-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1364-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5048-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5048-2-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5048-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5048-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5048-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5100-1-0x0000000004AA0000-0x0000000004B3C000-memory.dmp

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memory/5100-5-0x0000000004B60000-0x0000000004C7B000-memory.dmp

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