djvu | 3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882

Analysis

max time kernel
146s
max time network
153s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
20/05/2024, 12:54

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General

Target
3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
Size 728KB
Sample240520-p5kf3abe36
SHA256 3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882
MD5 dc63173384ebef8ac53e1862fa9465eb
SHA1 b963a9afd02903bdada23fc63ccbd0d23b98419d
SHA512 e01775835863982b6b376ac8ce1404ec295c75179da64c68a5be0a60107ac81c480ab8e3fbf76cf14d168612b546f102de1a0f15985fda84dd12dfa8c55e066c
SSDEEP 12288:gfZxRYM1fX/TTKTSVbcjBsAeZwiZlUUIJsV0jvtDFq0:SH5XfKTO6siiZlUDJG4Zq0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

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

Attributes

extension
.vepi
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: 0871PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/3144-2-0x00000000022B0000-0x00000000023CB000-memory.dmp	family_djvu
behavioral2/memory/2260-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2260-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2260-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2260-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2260-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2144-41-0x0000000000400000-0x0000000000537000-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
1784	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\\cf2756c8-a5ea-4722-b77e-c5df514b0aa8\\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe\" --AutoStart"	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.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 3144 set thread context of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 1892 set thread context of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.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
2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
2144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
2144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 3144 wrote to memory of 2260	3144	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	81
PID 2260 wrote to memory of 1784	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	82
PID 2260 wrote to memory of 1784	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	82
PID 2260 wrote to memory of 1784	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	82
PID 2260 wrote to memory of 1892	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	83
PID 2260 wrote to memory of 1892	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	83
PID 2260 wrote to memory of 1892	2260	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	83
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86
PID 1892 wrote to memory of 2144	1892	3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe	86

C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
"C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3144
- C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
  "C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\cf2756c8-a5ea-4722-b77e-c5df514b0aa8" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:1784
- - C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
    "C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1892
  - - C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
      "C:\Users\Admin\AppData\Local\Temp\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2144

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 ab2d2c145ab00319ef5b1c4fe09623700a26c25fa009dc18bc3cde11c5bda0ec
MD5 4729bdc0e745b3293b606e2af8a3986f
SHA1 5c5bca22089d566d5f4e2836ea97026952ae1b1d
SHA512 381e495c91ce282e54940596b53998e152e196eb257853e3c0d97a3e4a26cbf7041cfcaf179ad213d93058aeee9987292dd2302a1219b23a2190aa898910466a
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 4be3c2c86feac4284258f557985f5bcb2eadfd5aff1072a65be68b96011f034e
MD5 fe378761944022c4c9f2866e65d13615
SHA1 118580156128e166bf49a351762751a5d19e1c7e
SHA512 76bbedf5aea004b5b91a66989567046b75bc0699f3b356b4e74433e3ef535cd224069443e9741cc089dfc882e3e6ab4dbf5f04fc3465ef3475a08be30b636731
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 b672351500740d2e4b0d54ed3f392b63cbe7c0d4232378513a21efa907ff0af0
MD5 602acc8d0ee65d84eb368944696ee1f5
SHA1 4e6cce06ef0d5f4b83e56b2fb235fdfe58e33b02
SHA512 df072c80e5ee8a23642c2d689fedb5911ce8d45453dad4716013cf130f8371137e0d73676eb68ee79c50ff2919e8226834f88c75eaca70d75eff605ec0b7162e
MD5 SHA1 SHA512

Submit Download

3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe

Path C:\Users\Admin\AppData\Local\cf2756c8-a5ea-4722-b77e-c5df514b0aa8\3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882.exe
Size 728KB
SHA256 3a5d92caadc5452ae939468270051288bd71806d491ff3a5eedca22248db9882
MD5 dc63173384ebef8ac53e1862fa9465eb
SHA1 b963a9afd02903bdada23fc63ccbd0d23b98419d
SHA512 e01775835863982b6b376ac8ce1404ec295c75179da64c68a5be0a60107ac81c480ab8e3fbf76cf14d168612b546f102de1a0f15985fda84dd12dfa8c55e066c
SSDEEP 12288:gfZxRYM1fX/TTKTSVbcjBsAeZwiZlUUIJsV0jvtDFq0:SH5XfKTO6siiZlUDJG4Zq0
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1892-22-0x0000000000400000-0x0000000000500000-memory.dmp

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memory/1892-24-0x0000000000400000-0x0000000000500000-memory.dmp

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memory/2144-23-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-25-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-26-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-40-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-38-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-39-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-41-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2144-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2260-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2260-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2260-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2260-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2260-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3144-1-0x0000000002200000-0x00000000022A1000-memory.dmp

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memory/3144-2-0x00000000022B0000-0x00000000023CB000-memory.dmp

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