djvu | 37a6006013b8ae6b136b4dbb44ba232de94e1bed2197a7243e9143cd3a18fffb

General

Target

4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
Size

837KB
MD5

b3757b09ed2150ce857f446c0c61363c
SHA1

04536100a4a8fc27dde91e006f4e2ea6b398b65e
SHA256

4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981
SHA512

c7fb0efb95a96177bcbc50a60f2d900f4f7328a0a98a64ead6fc6e00f52502c904815e1e0a8b309a764c77db1fa65a8e5da5104593e0d987fb6bf3f794a82119
SSDEEP

24576:c3eL/rX2Ev8KDHwSPxDwauHfz/eicEeb+8TYLL:NLz7x7PP+H7e0YfT4

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

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

Attributes

extension
.watz
offline_id
Lc3VTezPWbMhuVAQFzJUdeA68PwI7UDpc5aKHYt1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/2708-2-0x0000000003F80000-0x000000000409B000-memory.dmp	family_djvu
behavioral2/memory/760-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/760-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/760-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/760-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/760-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-41-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1900-42-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3396-43-0x0000000000400000-0x000000000211B000-memory.dmp	family_djvu
behavioral2/memory/1900-44-0x0000000000400000-0x0000000000537000-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-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2960	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-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\2d721875-e334-427d-b663-1a15a6a71abb\\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe\" --AutoStart"	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.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
17	api.2ip.ua
18	api.2ip.ua
23	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2708 set thread context of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 3396 set thread context of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
1900	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
1900	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 2708 wrote to memory of 760	2708	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	88
PID 760 wrote to memory of 2960	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	91
PID 760 wrote to memory of 2960	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	91
PID 760 wrote to memory of 2960	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	91
PID 760 wrote to memory of 3396	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	92
PID 760 wrote to memory of 3396	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	92
PID 760 wrote to memory of 3396	760	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	92
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95
PID 3396 wrote to memory of 1900	3396	4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe	95

C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
"C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2708
- C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
  "C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:760
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\2d721875-e334-427d-b663-1a15a6a71abb" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2960
- - C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
    "C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3396
  - - C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe
      "C:\Users\Admin\AppData\Local\Temp\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:1900

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
1KB

MD5
7fb5fa1534dcf77f2125b2403b30a0ee

SHA1
365d96812a69ac0a4611ea4b70a3f306576cc3ea

SHA256
33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f

SHA512
a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8

Filesize
436B

MD5
971c514f84bba0785f80aa1c23edfd79

SHA1
732acea710a87530c6b08ecdf32a110d254a54c8

SHA256
f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895

SHA512
43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
174B

MD5
0bb9a38da0e754c6f03b06a156b54571

SHA1
451711381ccaa24dbfa148e0e19273f34649ffdf

SHA256
d699a4dcd6e377edc0b58df52344058103d65d74604560d90ede076f6b7e6ea6

SHA512
8f30f666bfbe9355d62bdf0b7b357c26938e0be8c19237c0b06f784a776a15c436f05b979f3e4c565bbc1ea87516564bb08cd4b22cdc854492f87d8244b72f9c

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8

Filesize
170B

MD5
c7df739d34e82e9eb01bd8886ed08fcb

SHA1
564a0fadad1f4d876917e410a53d5d70c9b7a789

SHA256
0d66b06318c87108d8db3428a2964cb81a94d0c38509cc254aacf7e0ff52fa10

SHA512
bf469872476c098e175e0db1d55c5e73d98f97bf25d252e039a701d68e832470e2c3fee62c32687eb589b012793d4011ee34120ab4ced446156590c5774660ee

Download Submit
C:\Users\Admin\AppData\Local\2d721875-e334-427d-b663-1a15a6a71abb\4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981.exe

Filesize
837KB

MD5
b3757b09ed2150ce857f446c0c61363c

SHA1
04536100a4a8fc27dde91e006f4e2ea6b398b65e

SHA256
4bb311ba0e479264b1d3c7deab5bfb44b0c1fb100d82aa7d605369b0ac938981

SHA512
c7fb0efb95a96177bcbc50a60f2d900f4f7328a0a98a64ead6fc6e00f52502c904815e1e0a8b309a764c77db1fa65a8e5da5104593e0d987fb6bf3f794a82119

Download Submit
memory/760-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/760-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/760-19-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/760-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/760-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-38-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-44-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-34-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-33-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-32-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-42-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-40-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1900-41-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2708-1-0x0000000003EE0000-0x0000000003F73000-memory.dmp

Filesize
588KB

Download
memory/2708-2-0x0000000003F80000-0x000000000409B000-memory.dmp

Filesize
1.1MB

Download
memory/3396-25-0x0000000000400000-0x000000000211B000-memory.dmp

Filesize
29.1MB

Download
memory/3396-43-0x0000000000400000-0x000000000211B000-memory.dmp

Filesize
29.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads