djvu | d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc | Triage

Analysis

max time kernel
439s
max time network
444s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
27/03/2024, 20:28

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General

Target

buildz.exe
Size

728KB
MD5

1ac225bc36c31f9209f984210bd68469
SHA1

b43db3c1f19bca6b35e91ee88edf8c80d4e6c422
SHA256

d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc
SHA512

e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3
SSDEEP

12288:yCLwobUsKbD6axHJhie99gldRoo+uoagdWip+KSN7uO7/:yYsmaZJwAglLoo+5WioKSN7ue/

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

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

Attributes

extension
.vook
offline_id
1eSPzWRaNslCgtjBZfL5pzvovoiaVI4IZSnvAwt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://sajdfue.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/3ed7a617738550b0a00c5aa231c0752020240316170955/d71ce1 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: 0857PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 9 IoCs

resource	yara_rule
behavioral4/memory/1048-2-0x0000000002580000-0x000000000269B000-memory.dmp	family_djvu
behavioral4/memory/4544-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

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

Modifies file permissions 1 TTPs 1 IoCs

File and Directory Permissions Modification

pid	Process
4340	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3084248216-1643706459-906455512-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1\\buildz.exe\" --AutoStart"	buildz.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
1	api.2ip.ua
2	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1048 set thread context of 4544	1048	buildz.exe	80
PID 4072 set thread context of 3560	4072	buildz.exe	85

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
3060	3560	WerFault.exe	85

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4544	buildz.exe
4544	buildz.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85

C:\Users\Admin\AppData\Local\Temp\buildz.exe
"C:\Users\Admin\AppData\Local\Temp\buildz.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1048
- C:\Users\Admin\AppData\Local\Temp\buildz.exe
  "C:\Users\Admin\AppData\Local\Temp\buildz.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4544
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4340
- - C:\Users\Admin\AppData\Local\Temp\buildz.exe
    "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4072
  - - C:\Users\Admin\AppData\Local\Temp\buildz.exe
      "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      PID:3560
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3560 -s 600
        5⤵
        Program crash
        
        PID:3060

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3560 -ip 3560
1⤵
PID:1776

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1\buildz.exe

Filesize
728KB

MD5
1ac225bc36c31f9209f984210bd68469

SHA1
b43db3c1f19bca6b35e91ee88edf8c80d4e6c422

SHA256
d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc

SHA512
e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3

Download Submit
memory/1048-1-0x0000000002410000-0x00000000024B1000-memory.dmp

Filesize
644KB

Download
memory/1048-2-0x0000000002580000-0x000000000269B000-memory.dmp

Filesize
1.1MB

Download
memory/3560-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3560-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3560-25-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4072-20-0x0000000002380000-0x0000000002416000-memory.dmp

Filesize
600KB

Download
memory/4544-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download