djvu | e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

General

Target

buildz.exe
Size

709KB
MD5

b7cb7f2b5cd9bd047710650295dc88f7
SHA1

3740ba8e89055cb0f5068ec9176b05c77432e799
SHA256

e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f
SHA512

e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471
SSDEEP

12288:9CwgCcyMy1Nncixi2NWXCAcrIQBjljKsFKfFDKZNF:9cCp9KGiAAcUwjljKAK8ZNF

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

C2

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

Attributes

extension
.qual
offline_id
KLbRmn6on3AXGFgDLGtd0IkHmV7uHw9VxlcxO5t1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 9 IoCs

Processes:

resource	yara_rule
behavioral3/memory/4760-2-0x00000000022A0000-0x00000000023BB000-memory.dmp	family_djvu
behavioral3/memory/4484-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/4484-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/4484-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/4484-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/4484-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/3528-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/3528-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral3/memory/3528-27-0x0000000000400000-0x0000000000537000-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

Processes:

buildz.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	buildz.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

Processes:

icacls.exe

pid	Process
1028	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

buildz.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\6a76045d-9630-4073-a2cb-1ab05c4441dd\\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.

Processes:

flow	ioc
9	api.2ip.ua
11	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

Processes:

buildz.exebuildz.exe

description	pid	Process	procid_target
PID 4760 set thread context of 4484	4760	buildz.exe	84
PID 324 set thread context of 3528	324	buildz.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

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
3668	3528	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

Processes:

buildz.exeicacls.exebuildz.exebuildz.exebuildz.exe

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

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

buildz.exe

pid	Process
4484	buildz.exe
4484	buildz.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

buildz.exebuildz.exebuildz.exe

description	pid	Process	procid_target
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4760 wrote to memory of 4484	4760	buildz.exe	84
PID 4484 wrote to memory of 1028	4484	buildz.exe	85
PID 4484 wrote to memory of 1028	4484	buildz.exe	85
PID 4484 wrote to memory of 1028	4484	buildz.exe	85
PID 4484 wrote to memory of 324	4484	buildz.exe	86
PID 4484 wrote to memory of 324	4484	buildz.exe	86
PID 4484 wrote to memory of 324	4484	buildz.exe	86
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88
PID 324 wrote to memory of 3528	324	buildz.exe	88

C:\Users\Admin\AppData\Local\Temp\buildz.exe
"C:\Users\Admin\AppData\Local\Temp\buildz.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4760
- C:\Users\Admin\AppData\Local\Temp\buildz.exe
  "C:\Users\Admin\AppData\Local\Temp\buildz.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:4484
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\6a76045d-9630-4073-a2cb-1ab05c4441dd" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:1028
- - C:\Users\Admin\AppData\Local\Temp\buildz.exe
    "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:324
  - - C:\Users\Admin\AppData\Local\Temp\buildz.exe
      "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      PID:3528
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3528 -s 568
        5⤵
        Program crash
        
        PID:3668

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3528 -ip 3528
1⤵
PID:32

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\6a76045d-9630-4073-a2cb-1ab05c4441dd\buildz.exe

Filesize
709KB

MD5
b7cb7f2b5cd9bd047710650295dc88f7

SHA1
3740ba8e89055cb0f5068ec9176b05c77432e799

SHA256
e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

SHA512
e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471

Download Submit
memory/324-25-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/324-21-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/3528-24-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3528-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3528-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4484-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4484-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4484-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4484-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4484-19-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4760-2-0x00000000022A0000-0x00000000023BB000-memory.dmp

Filesize
1.1MB

Download
memory/4760-1-0x00000000009B0000-0x0000000000A51000-memory.dmp

Filesize
644KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads