djvu | c9b54d5f8b3a9b1da0c9765305c3487351a8ac8f2c8683284ea632910e92e132

General

Target

file.exe
Size

784KB
MD5

e6f92be7f819410f58178b2a32c02ece
SHA1

b019e06385f601bd88ff71a43ed274a8f46a354c
SHA256

c9b54d5f8b3a9b1da0c9765305c3487351a8ac8f2c8683284ea632910e92e132
SHA512

e06a7457d0ba3a24e83595674df30655ad1d8880980cb6f2df5b80d46a7fbece1ee08e5d74208e5e40e93852742e163f400db1ebecf13e94b2085c1b182e5c74
SSDEEP

24576:3ISrb5ModOgj6b2D/qjyAxOw4klV0b3CMX1IG:xtMAj9XcFWx1

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

http://habrafa.com/test2/get.php

Attributes

extension
.cdtt
offline_id
Bn3q97hwLouKbhkQRNO4SeV07gjdEQVm8NKhg0t1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 16 IoCs

resource	yara_rule
behavioral2/memory/4620-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4620-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4620-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4620-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4968-2-0x0000000002250000-0x000000000236B000-memory.dmp	family_djvu
behavioral2/memory/4620-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-29-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4344-40-0x0000000000400000-0x0000000000537000-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
4552	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-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\53431bd0-7fc9-459c-bb77-38f1c9038358\\file.exe\" --AutoStart"	file.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
4	api.2ip.ua
20	api.2ip.ua
3	api.2ip.ua

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4968 set thread context of 4620	4968	file.exe	21

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4620	file.exe
4620	file.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4968 wrote to memory of 4620	4968	file.exe	21
PID 4620 wrote to memory of 4552	4620	file.exe	56
PID 4620 wrote to memory of 4552	4620	file.exe	56
PID 4620 wrote to memory of 4552	4620	file.exe	56

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4968
- C:\Users\Admin\AppData\Local\Temp\file.exe
  "C:\Users\Admin\AppData\Local\Temp\file.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4620
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\53431bd0-7fc9-459c-bb77-38f1c9038358" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4552
- - C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    PID:4316
  - - C:\Users\Admin\AppData\Local\Temp\file.exe
      "C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      PID:4344

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4316-20-0x00000000006D0000-0x0000000000762000-memory.dmp

Filesize
584KB

Download
memory/4344-31-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-40-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-39-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-37-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-29-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-38-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4344-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4620-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4620-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4620-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4620-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4620-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4968-1-0x00000000005A0000-0x0000000000640000-memory.dmp

Filesize
640KB

Download
memory/4968-2-0x0000000002250000-0x000000000236B000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads