djvu | b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1

Analysis

max time kernel
146s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
01/05/2024, 20:30

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General

Target
b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
Size 788KB
Sample240501-zagf2afh6v
SHA256 b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1
MD5 faf08db76db341946b96da72d0389309
SHA1 8a9dcad253f94dd42f38edd7cd41ee90a4a82733
SHA512 d592550e5c3a4461a3f4924735c8edd8bf3af692c14f8530854e3db75428349e6f1c8c8eeb4092418eb5956f3d825a4e7d94dc5c9602589c3be643614892a99a
SSDEEP 24576:slxfqw/4CKl1FoaEXI+qxnO2zRPfM6Qs:kfn/4CoovtenfhfvN
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 15 IoCs

resource	yara_rule
behavioral2/memory/5012-2-0x0000000004A20000-0x0000000004B3B000-memory.dmp	family_djvu
behavioral2/memory/2072-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2072-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2072-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2072-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2072-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-28-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2212-37-0x0000000000400000-0x0000000000537000-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
4880	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-1-5-21-734199974-1358367239-436541239-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\69e1cfb2-8167-4d0a-9c5e-20eff6453f9d\\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe\" --AutoStart"	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.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
6	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5012 set thread context of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 1992 set thread context of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.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
2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
2212	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
2212	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 5012 wrote to memory of 2072	5012	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	81
PID 2072 wrote to memory of 4880	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	82
PID 2072 wrote to memory of 4880	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	82
PID 2072 wrote to memory of 4880	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	82
PID 2072 wrote to memory of 1992	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	83
PID 2072 wrote to memory of 1992	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	83
PID 2072 wrote to memory of 1992	2072	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	83
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86
PID 1992 wrote to memory of 2212	1992	b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe	86

C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
"C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5012
- C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
  "C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2072
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\69e1cfb2-8167-4d0a-9c5e-20eff6453f9d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4880
- - C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
    "C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1992
  - - C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
      "C:\Users\Admin\AppData\Local\Temp\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2212

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 719698173bbfbb3375c5e0c43342f785c76727fcd6560364e0d9bec77232a6f5
MD5 56282e3f56542f67e60909a4345c5a35
SHA1 1a627ec9980ee9e3f5846da3b63552122032f78b
SHA512 291a1569239659ae5c1466d324f6c0114653f2b1578e59f1f340decf189aa38ccf9599c2005551e09ce94f2bceb94f64773181fc011dc1167edd4aa9b1b4d11e
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 1bad91976fd436cb5f68d6ca647fff19ad67393e7c3de9f289366cbe4e592e1c
MD5 97f4a73710118c95cd8db60db93ed15b
SHA1 1c91efd3874d9bb2cf4261db2d9129176766f19d
SHA512 55edd26769b4327952b096c7300241f39d35e8197d919b26a21f901ca3bd7d3cb1176a0f8215d303d67003610c86f05ed06a15d4cc0b282bf94607e064e00cbe
MD5 SHA1 SHA512

Submit Download

CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 8c106661730e9cf0afc7ab77428002038c193837a65e5bb6ef17239bcabf82fb
MD5 27c865f6958aec78e0dd13c8f2fc77e5
SHA1 02bdfc19190d5cb1090c8ef8dd01b8af68de0cc8
SHA512 ea15c3282d0b5a34c2df0c5e39aa3caa126cf9d4e5f9bc7a9ef98f22ba59c054819261feb84dfcbf5b4af1569ab6bd9e1946191052d0e0bb893965b04a0dfa46
MD5 SHA1 SHA512

Submit Download

b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe

Path C:\Users\Admin\AppData\Local\69e1cfb2-8167-4d0a-9c5e-20eff6453f9d\b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1.exe
Size 788KB
SHA256 b78c763612c40557dd7cf7d0a3e8a5ae302d2161092c18ec7e8f55bb4dae92b1
MD5 faf08db76db341946b96da72d0389309
SHA1 8a9dcad253f94dd42f38edd7cd41ee90a4a82733
SHA512 d592550e5c3a4461a3f4924735c8edd8bf3af692c14f8530854e3db75428349e6f1c8c8eeb4092418eb5956f3d825a4e7d94dc5c9602589c3be643614892a99a
SSDEEP 24576:slxfqw/4CKl1FoaEXI+qxnO2zRPfM6Qs:kfn/4CoovtenfhfvN
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2072-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2072-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2072-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2072-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2072-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-29-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-27-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-28-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-34-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2212-37-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/5012-2-0x0000000004A20000-0x0000000004B3B000-memory.dmp

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memory/5012-1-0x0000000003030000-0x00000000030C6000-memory.dmp

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