djvu | 444cf71032e7c7be2a79255af4fb38bab0333fb0a060ecc3fe91473d26ebce83

Analysis

max time kernel
143s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
24/04/2024, 10:06

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General

Target
f4c37292b365c19e6d2feeb6a17c4049.exe
Size 780KB
Sample240424-l43dpsgf7w
SHA256 444cf71032e7c7be2a79255af4fb38bab0333fb0a060ecc3fe91473d26ebce83
MD5 f4c37292b365c19e6d2feeb6a17c4049
SHA1 a7c201719a6c4e58f57baa2a88b110d72f3daefe
SHA512 8436f1f96c2ea3487e1205d2f0dbf8db33fc622a9d863f39402802a8c16bb05897477ba58d57fcb7d7a6bb265c52a25331ac5505dd3ac2c6b3fc2823eb56f805
SSDEEP 12288:6DcWGLixjy0li5QMCgpMeahQ+siBwpBezGbkhvYesVmKiOAfc4Cz9fA1iqCD:6iily4i3CgeSKBtXKiMt9fa8D
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 9 IoCs

resource	yara_rule
behavioral2/memory/1432-2-0x0000000005E20000-0x0000000005F3B000-memory.dmp	family_djvu
behavioral2/memory/3832-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3832-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3832-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3832-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3832-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4276-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4276-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4276-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	f4c37292b365c19e6d2feeb6a17c4049.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
748	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-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\daef4c99-439b-4f1a-a58c-c47bd793b5cd\\f4c37292b365c19e6d2feeb6a17c4049.exe\" --AutoStart"	f4c37292b365c19e6d2feeb6a17c4049.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
5	api.2ip.ua
7	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1432 set thread context of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 388 set thread context of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1748	4276	WerFault.exe	95

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3832	f4c37292b365c19e6d2feeb6a17c4049.exe
3832	f4c37292b365c19e6d2feeb6a17c4049.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 1432 wrote to memory of 3832	1432	f4c37292b365c19e6d2feeb6a17c4049.exe	91
PID 3832 wrote to memory of 748	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	92
PID 3832 wrote to memory of 748	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	92
PID 3832 wrote to memory of 748	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	92
PID 3832 wrote to memory of 388	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	93
PID 3832 wrote to memory of 388	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	93
PID 3832 wrote to memory of 388	3832	f4c37292b365c19e6d2feeb6a17c4049.exe	93
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95
PID 388 wrote to memory of 4276	388	f4c37292b365c19e6d2feeb6a17c4049.exe	95

C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe
"C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1432
- C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe
  "C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3832
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\daef4c99-439b-4f1a-a58c-c47bd793b5cd" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:748
- - C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe
    "C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:388
  - - C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe
      "C:\Users\Admin\AppData\Local\Temp\f4c37292b365c19e6d2feeb6a17c4049.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      PID:4276
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4276 -s 568
        5⤵
        Program crash
        
        PID:1748

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4276 -ip 4276
1⤵
PID:5040

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=5240 --field-trial-handle=3240,i,13319578961094268484,16557498665191861597,262144 --variations-seed-version /prefetch:8
1⤵
PID:1904

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

f4c37292b365c19e6d2feeb6a17c4049.exe

Path C:\Users\Admin\AppData\Local\daef4c99-439b-4f1a-a58c-c47bd793b5cd\f4c37292b365c19e6d2feeb6a17c4049.exe
Size 780KB
SHA256 444cf71032e7c7be2a79255af4fb38bab0333fb0a060ecc3fe91473d26ebce83
MD5 f4c37292b365c19e6d2feeb6a17c4049
SHA1 a7c201719a6c4e58f57baa2a88b110d72f3daefe
SHA512 8436f1f96c2ea3487e1205d2f0dbf8db33fc622a9d863f39402802a8c16bb05897477ba58d57fcb7d7a6bb265c52a25331ac5505dd3ac2c6b3fc2823eb56f805
SSDEEP 12288:6DcWGLixjy0li5QMCgpMeahQ+siBwpBezGbkhvYesVmKiOAfc4Cz9fA1iqCD:6iily4i3CgeSKBtXKiMt9fa8D
MD5 SHA1 SHA512 SSDEEP

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memory/388-18-0x0000000004220000-0x00000000042BA000-memory.dmp

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memory/1432-1-0x0000000004540000-0x00000000045DA000-memory.dmp

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memory/1432-2-0x0000000005E20000-0x0000000005F3B000-memory.dmp

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memory/3832-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3832-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3832-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3832-6-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3832-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4276-22-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4276-25-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4276-23-0x0000000000400000-0x0000000000537000-memory.dmp

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