djvu | af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d

Analysis

max time kernel
144s
max time network
123s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
26/05/2024, 08:30

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General

Target
af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
Size 732KB
Sample240526-kel5radc54
SHA256 af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d
MD5 193f694e6a67100c6b996f04ac809a0a
SHA1 58790a163d99e9dc5ed5705cd448de5408587c04
SHA512 4ec5c02989386764befc98e42dc1afbb1c6a7cba450f87c44bea34dd52e1fa8542575456f165a4a52faa96156f12e0326a2d5dfe80977584f1f744b87bc079bc
SSDEEP 12288:6SPKciw2C0t1khB740hcNhHaDQufywx6yWBjGZT9wp/NFSd9JJMHC31ziIK:6SicqEx40hcNIf9xravpKdjJX3AIK
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/1088-2-0x0000000004AD0000-0x0000000004BEB000-memory.dmp	family_djvu
behavioral2/memory/4480-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4480-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1832-37-0x0000000000400000-0x0000000000537000-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
3008	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-1-5-21-3938118698-2964058152-2337880935-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\6d983583-bae8-4207-b3c7-323556aecedd\\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe\" --AutoStart"	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.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 1088 set thread context of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1844 set thread context of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83

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
4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
1832	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
1832	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 1088 wrote to memory of 4480	1088	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	78
PID 4480 wrote to memory of 3008	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	79
PID 4480 wrote to memory of 3008	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	79
PID 4480 wrote to memory of 3008	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	79
PID 4480 wrote to memory of 1844	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	80
PID 4480 wrote to memory of 1844	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	80
PID 4480 wrote to memory of 1844	4480	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	80
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83
PID 1844 wrote to memory of 1832	1844	af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe	83

C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
"C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
  "C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4480
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\6d983583-bae8-4207-b3c7-323556aecedd" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3008
- - C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
    "C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1844
  - - C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
      "C:\Users\Admin\AppData\Local\Temp\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1832

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 90bd14730c49d9de6f5d78f7d2f744b0645a1f018e44877b83c6bab81d4531a4
MD5 be3f0a04d543b64dfc8f405ea4a5505b
SHA1 897b54fc3338a7d42f3bf579095f061da3eccb56
SHA512 a0d8c9a7e0914cbebc67773a7acee36090c9fb0cfcadfea8c1cb606ae060d227d5cecea379b483fe8de91f3a2e6c5cdf4141f5be6979444e974ff1e3a24682b7
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 5cfb8430dde76a2b978d422404233d7ad236900ec90ceb3588619fb9f1866d6b
MD5 7812c64231bbe37849d48beda2c56157
SHA1 3a072178643c71a9289ef41700dfe2f79fb3e690
SHA512 ccfe1487dde3b19843a7d9f5adc5e3fb575059b8b0f5c3cbe00471a62329767409c3a0f0e7eb21b74c6880b0187bc9ca3b2bcba858f9d950b82e965c55311722
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 92f309b6c77894ba5b1ea9cadb7347c6e23c9ad5084382c5709c188ce2cc2840
MD5 fa1dcc4baba8a8e83d9e01fdf0930cf1
SHA1 068bc3dde0539fa0a0c21b85850454c1ee83bc35
SHA512 4d8dcf97cd007b1c0eda0791912a8cb3873249040fe7f41a7543f3f4f1faaa91a1c6b7e1d0d0edebee2ec62d63830e5c8ab51c9dd7cbfe3a76ef75a214ba7c12
MD5 SHA1 SHA512

Submit Download

af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe

Path C:\Users\Admin\AppData\Local\6d983583-bae8-4207-b3c7-323556aecedd\af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d.exe
Size 732KB
SHA256 af8b7097ef6885e790b4d8bc06e51c99572e939b49ed8e31135d58da14b4117d
MD5 193f694e6a67100c6b996f04ac809a0a
SHA1 58790a163d99e9dc5ed5705cd448de5408587c04
SHA512 4ec5c02989386764befc98e42dc1afbb1c6a7cba450f87c44bea34dd52e1fa8542575456f165a4a52faa96156f12e0326a2d5dfe80977584f1f744b87bc079bc
SSDEEP 12288:6SPKciw2C0t1khB740hcNhHaDQufywx6yWBjGZT9wp/NFSd9JJMHC31ziIK:6SicqEx40hcNIf9xravpKdjJX3AIK
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1088-2-0x0000000004AD0000-0x0000000004BEB000-memory.dmp

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memory/1088-1-0x0000000004A20000-0x0000000004AC1000-memory.dmp

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memory/1832-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1832-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4480-19-0x0000000000400000-0x0000000000537000-memory.dmp

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