djvu | 2b31b3a43d6cf9f80d7b46f77dc3935ecdd7caeade5daebe1438417060fa60a0

General

Target

sample.exe
Size

775KB
MD5

b318b2664abf0d93433255643aaae35c
SHA1

9f8748a0459a6cef1a67c3b44c21f3eaa8e360f0
SHA256

4fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2
SHA512

f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f
SSDEEP

12288:uqyWSUBQv0EroDgRgp4LPTskElzS9zad8HT/AB+c9X+oeJzYf94SRZj1LJ+H:uqNQv0XDegs2SpSI0X+oB4SRZjxgH

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

http://fuyt.org/fhsgtsspen6/get.php

Attributes

extension
.uyjh
offline_id
LgcOIftV0dQfFBQStVNfb8BhHy8tHRPvXwSiFwt1
payload_url
http://zerit.top/dl/build2.exe

http://fuyt.org/files/1/build3.exe
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 9 IoCs

resource	yara_rule
behavioral2/memory/2816-2-0x0000000002380000-0x000000000249B000-memory.dmp	family_djvu
behavioral2/memory/4840-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4840-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4840-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4840-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4840-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2416-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2416-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2416-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Djvu family
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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	sample.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2808	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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f\\sample.exe\" --AutoStart"	sample.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
6	api.2ip.ua
7	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2816 set thread context of 4840	2816	sample.exe	83
PID 2832 set thread context of 2416	2832	sample.exe	88

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
2444	2416	WerFault.exe	88

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	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4840	sample.exe
4840	sample.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 2816 wrote to memory of 4840	2816	sample.exe	83
PID 4840 wrote to memory of 2808	4840	sample.exe	84
PID 4840 wrote to memory of 2808	4840	sample.exe	84
PID 4840 wrote to memory of 2808	4840	sample.exe	84
PID 4840 wrote to memory of 2832	4840	sample.exe	85
PID 4840 wrote to memory of 2832	4840	sample.exe	85
PID 4840 wrote to memory of 2832	4840	sample.exe	85
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88
PID 2832 wrote to memory of 2416	2832	sample.exe	88

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2816
- C:\Users\Admin\AppData\Local\Temp\sample.exe
  "C:\Users\Admin\AppData\Local\Temp\sample.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:4840
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2808
- - C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2832
  - - C:\Users\Admin\AppData\Local\Temp\sample.exe
      "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      PID:2416
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2416 -s 584
        5⤵
        Program crash
        
        PID:2444

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2416 -ip 2416
1⤵
PID:3556

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\Local\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f\sample.exe

Filesize
775KB

MD5
b318b2664abf0d93433255643aaae35c

SHA1
9f8748a0459a6cef1a67c3b44c21f3eaa8e360f0

SHA256
4fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2

SHA512
f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f

Download Submit
memory/2416-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2416-26-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2416-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2816-2-0x0000000002380000-0x000000000249B000-memory.dmp

Filesize
1.1MB

Download
memory/2816-1-0x0000000002260000-0x00000000022FB000-memory.dmp

Filesize
620KB

Download
memory/2832-21-0x0000000000400000-0x00000000004CC000-memory.dmp

Filesize
816KB

Download
memory/2832-27-0x0000000000400000-0x00000000004CC000-memory.dmp

Filesize
816KB

Download
memory/4840-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4840-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4840-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4840-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4840-19-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads