djvu | 36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216

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
20/05/2024, 04:30

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General

Target
36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
Size 728KB
Sample240520-e4vwascd2z
SHA256 36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216
MD5 3126b4d37ccbef6d938d706317a6679e
SHA1 8df385167e45ecf93346af81d8a5987ddd9e6f41
SHA512 cefe66787cf4d4f6424adca16fd08dbbfdcb26e3bab642a6c7ad1b0ef1f5aba75a18b64ee9478957d6abef230f8b484938f3664af1abb13d85feb1445514c087
SSDEEP 12288:M0o7B9QE4e17PxB7BY5P/1QH8cV4DXmYGu09KNycFvzF0V1tWJRFq0:wJ4e1FBq5PtFY4DXFt09doqkFq0
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/4452-2-0x00000000022A0000-0x00000000023BB000-memory.dmp	family_djvu
behavioral2/memory/1000-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1000-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1000-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1000-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1000-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1452-41-0x0000000000400000-0x0000000000537000-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
4844	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-1-5-21-1230210488-3096403634-4129516247-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\0a8bbd53-8a2a-4945-90ae-0daf1de7d2ac\\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe\" --AutoStart"	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.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 4452 set thread context of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 1608 set thread context of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.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
1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
1452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
1452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 4452 wrote to memory of 1000	4452	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	80
PID 1000 wrote to memory of 4844	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	81
PID 1000 wrote to memory of 4844	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	81
PID 1000 wrote to memory of 4844	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	81
PID 1000 wrote to memory of 1608	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	83
PID 1000 wrote to memory of 1608	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	83
PID 1000 wrote to memory of 1608	1000	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	83
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86
PID 1608 wrote to memory of 1452	1608	36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe	86

C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
"C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4452
- C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
  "C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1000
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\0a8bbd53-8a2a-4945-90ae-0daf1de7d2ac" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4844
- - C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
    "C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1608
  - - C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
      "C:\Users\Admin\AppData\Local\Temp\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1452

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 ed35539ae2e3de90b4d09f6dbed4fc19febf9c5ec3b9e54bbe6b972a89bd63c0
MD5 cbc282c89eaf33dcc25496b655dd3335
SHA1 12d03e52947a33c0aa0cb46699d361ea92c319d2
SHA512 eb2411b661feeccc44ea7b9bf096279a9c5a9fd504836ba827fcb9b6a815796a8fd4b03c8ec0e36ea7eebe82c0f059cbca3509e52a400921401a1b485bcc360b
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 a60713ad5353a9dce6205710101425132f369343f47f68dc8f8a9375376fd4dd
MD5 de224df8584da306b2a9b6327d4dc6b7
SHA1 dbeac0d528983ec8835c46e0f6e50f1674a325d6
SHA512 58704cef0864cdab5ad25a1077747851351173c4483a118402fd403d8d680266942dc3e98f1b731851c46c7b967046bf4b30370ebbcd90f0bad010a26ffe7c7f
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 6ece7f15f9eceab7de386768931e960e950130e3583c2ada675eadf1adef6857
MD5 13ccd19df5739b560614d7e1fce5b10b
SHA1 90df5b973107b95b0b792e0a3ba8d33d4b36a29e
SHA512 b58a43f0b65627bcdfeddd5d5096957674112b27cab9857fbe76116c76abc41668ae52ec27f0800f99997211df2d81e9d47c427972f291f4e3c14a96fa16da89
MD5 SHA1 SHA512

Submit Download

36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe

Path C:\Users\Admin\AppData\Local\0a8bbd53-8a2a-4945-90ae-0daf1de7d2ac\36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216.exe
Size 728KB
SHA256 36ca1ca95c36322c60e75f6dd9a0955f83340f4e25140b3757c4389905c25216
MD5 3126b4d37ccbef6d938d706317a6679e
SHA1 8df385167e45ecf93346af81d8a5987ddd9e6f41
SHA512 cefe66787cf4d4f6424adca16fd08dbbfdcb26e3bab642a6c7ad1b0ef1f5aba75a18b64ee9478957d6abef230f8b484938f3664af1abb13d85feb1445514c087
SSDEEP 12288:M0o7B9QE4e17PxB7BY5P/1QH8cV4DXmYGu09KNycFvzF0V1tWJRFq0:wJ4e1FBq5PtFY4DXFt09doqkFq0
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1000-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1000-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1000-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1000-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1000-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-24-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-41-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-40-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-23-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-39-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-38-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-26-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1452-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1608-21-0x0000000000400000-0x00000000004FF000-memory.dmp

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memory/1608-25-0x0000000000400000-0x00000000004FF000-memory.dmp

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memory/4452-2-0x00000000022A0000-0x00000000023BB000-memory.dmp

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memory/4452-1-0x0000000002200000-0x0000000002297000-memory.dmp

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