djvu | 6aae67d87cd2ef23c4b9265c8e83db5142f00154e66e47b1e54219cea794682b

Analysis

max time kernel
126s
max time network
135s
platform
windows10_x64
resource
win10-en-20211014
submitted
19/10/2021, 14:29

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General

Target
c81d1895f7472cec079c7f12419feaf0.exe
Size 820KB
Sample211019-rtkc2aghdj
SHA256 6aae67d87cd2ef23c4b9265c8e83db5142f00154e66e47b1e54219cea794682b
MD5 c81d1895f7472cec079c7f12419feaf0
SHA1 729557420c331200cbad77b7f98a0f5841933a63
SHA512 9fbb32e99b3a321f5c5ea1c2bea24249ca5b335514f3f6a70342609932a45aab324d71030febbd18b0aa6d63698146a384ba37da17f7a84d4018ab48660d52cc
MD5 SHA1 SHA512

Score

10^/10

djvu vidar 517 discovery persistence ransomware spyware stealer suricata

Malware Config

Extracted

Family

vidar

Version

41.3

Botnet

https://mas.to/@oleg98

Attributes

profile_id
517

Extracted

Family

djvu

http://rlrz.org/fhsgtsspen6

Signatures

Detected Djvu ransomware 6 IoCs

resource	yara_rule
behavioral2/memory/2068-116-0x0000000004AB0000-0x0000000004BCB000-memory.dmp	family_djvu
behavioral2/memory/1060-117-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/1060-118-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/1060-119-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3292-125-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/3292-130-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata

Vidar Stealer 4 IoCs

stealer

resource	yara_rule
behavioral2/memory/188-135-0x0000000000400000-0x00000000004D9000-memory.dmp	family_vidar
behavioral2/memory/188-136-0x00000000004A192D-mapping.dmp	family_vidar
behavioral2/memory/188-139-0x0000000000400000-0x00000000004D9000-memory.dmp	family_vidar
behavioral2/memory/3952-138-0x00000000033E0000-0x00000000034B6000-memory.dmp	family_vidar

Downloads MZ/PE file

Executes dropped EXE 4 IoCs

pid	Process
3952	build2.exe
188	build2.exe
2488	build3.exe
1740	build3.exe

Loads dropped DLL 2 IoCs

pid	Process
188	build2.exe
188	build2.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
908	icacls.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses 2FA software files, possible credential harvesting 2 TTPs
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-941723256-3451054534-3089625102-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\f708d81e-f173-4e0e-b5ad-06d497c5dfaf\\c81d1895f7472cec079c7f12419feaf0.exe\" --AutoStart"	c81d1895f7472cec079c7f12419feaf0.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

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
8	api.2ip.ua
9	api.2ip.ua
20	api.2ip.ua

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2068 set thread context of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 3948 set thread context of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3952 set thread context of 188	3952	build2.exe	75
PID 2488 set thread context of 1740	2488	build3.exe	77

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	build2.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	build2.exe

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1564	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1996	timeout.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2400	taskkill.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	c81d1895f7472cec079c7f12419feaf0.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	c81d1895f7472cec079c7f12419feaf0.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
1060	c81d1895f7472cec079c7f12419feaf0.exe
1060	c81d1895f7472cec079c7f12419feaf0.exe
3292	c81d1895f7472cec079c7f12419feaf0.exe
3292	c81d1895f7472cec079c7f12419feaf0.exe
188	build2.exe
188	build2.exe
188	build2.exe
188	build2.exe
188	build2.exe
188	build2.exe
188	build2.exe
188	build2.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2400	taskkill.exe

Suspicious use of WriteProcessMemory 61 IoCs

description	pid	Process	procid_target
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 2068 wrote to memory of 1060	2068	c81d1895f7472cec079c7f12419feaf0.exe	69
PID 1060 wrote to memory of 908	1060	c81d1895f7472cec079c7f12419feaf0.exe	70
PID 1060 wrote to memory of 908	1060	c81d1895f7472cec079c7f12419feaf0.exe	70
PID 1060 wrote to memory of 908	1060	c81d1895f7472cec079c7f12419feaf0.exe	70
PID 1060 wrote to memory of 3948	1060	c81d1895f7472cec079c7f12419feaf0.exe	71
PID 1060 wrote to memory of 3948	1060	c81d1895f7472cec079c7f12419feaf0.exe	71
PID 1060 wrote to memory of 3948	1060	c81d1895f7472cec079c7f12419feaf0.exe	71
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3948 wrote to memory of 3292	3948	c81d1895f7472cec079c7f12419feaf0.exe	73
PID 3292 wrote to memory of 3952	3292	c81d1895f7472cec079c7f12419feaf0.exe	74
PID 3292 wrote to memory of 3952	3292	c81d1895f7472cec079c7f12419feaf0.exe	74
PID 3292 wrote to memory of 3952	3292	c81d1895f7472cec079c7f12419feaf0.exe	74
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3952 wrote to memory of 188	3952	build2.exe	75
PID 3292 wrote to memory of 2488	3292	c81d1895f7472cec079c7f12419feaf0.exe	76
PID 3292 wrote to memory of 2488	3292	c81d1895f7472cec079c7f12419feaf0.exe	76
PID 3292 wrote to memory of 2488	3292	c81d1895f7472cec079c7f12419feaf0.exe	76
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 2488 wrote to memory of 1740	2488	build3.exe	77
PID 1740 wrote to memory of 1564	1740	build3.exe	78
PID 1740 wrote to memory of 1564	1740	build3.exe	78
PID 1740 wrote to memory of 1564	1740	build3.exe	78
PID 188 wrote to memory of 1156	188	build2.exe	80
PID 188 wrote to memory of 1156	188	build2.exe	80
PID 188 wrote to memory of 1156	188	build2.exe	80
PID 1156 wrote to memory of 2400	1156	cmd.exe	82
PID 1156 wrote to memory of 2400	1156	cmd.exe	82
PID 1156 wrote to memory of 2400	1156	cmd.exe	82
PID 1156 wrote to memory of 1996	1156	cmd.exe	84
PID 1156 wrote to memory of 1996	1156	cmd.exe	84
PID 1156 wrote to memory of 1996	1156	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
"C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2068
- C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
  "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe"
  2⤵
  - Adds Run key to start application
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1060
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\f708d81e-f173-4e0e-b5ad-06d497c5dfaf" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:908
- - C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
    "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3948
  - - C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe
      "C:\Users\Admin\AppData\Local\Temp\c81d1895f7472cec079c7f12419feaf0.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:3292
    - - C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
        
        "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:3952
      - C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe
        
        "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe"
        6⤵
        Executes dropped EXE
        Loads dropped DLL
        Checks processor information in registry
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:188
        
        C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build2.exe" & del C:\ProgramData\*.dll & exit
        7⤵
        Suspicious use of WriteProcessMemory
        
        PID:1156
        
        C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im build2.exe /f
        8⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2400
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 6
        8⤵
        Delays execution with timeout.exe
        
        PID:1996
    - - C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
        
        "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:2488
      - C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe
        
        "C:\Users\Admin\AppData\Local\373724ba-c062-4390-9905-90799aa567de\build3.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:1740
        
        C:\Windows\SysWOW64\schtasks.exe
        
        /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
        7⤵
        Creates scheduled task(s)
        
        PID:1564

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

File and Directory Permissions Modification

T1222

Install Root Certificate

T1130

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/188-139-0x0000000000400000-0x00000000004D9000-memory.dmp

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memory/188-135-0x0000000000400000-0x00000000004D9000-memory.dmp

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memory/1060-119-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1060-117-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1740-151-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/1740-146-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/2068-115-0x0000000004A16000-0x0000000004AA7000-memory.dmp

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memory/2068-116-0x0000000004AB0000-0x0000000004BCB000-memory.dmp

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memory/2488-150-0x0000000003380000-0x00000000034CA000-memory.dmp

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memory/3292-130-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3948-123-0x0000000004AA0000-0x0000000004B31000-memory.dmp

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memory/3952-138-0x00000000033E0000-0x00000000034B6000-memory.dmp

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memory/3952-134-0x0000000001956000-0x00000000019D2000-memory.dmp

Download