djvu | 3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e

Analysis

max time kernel
86s
max time network
150s
platform
windows10_x64
resource
win10-en
submitted
03/09/2021, 09:06

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General

Target
3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
Size 794KB
Sample210903-k2rnragack
SHA256 3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e
MD5 00326b533abf1a5ad4fa70b4962ab98f
SHA1 ee14ff58decbdd7d9d9908a93de009556dd0840a
SHA512 1517de94d9711b263b51b98a3d38dac1fab43d230adde7ea17e620e50e02a3321c45f2c00e81f2ac00982a190e9e83241ff8a08a8dc4401449cdbe450d722daf
MD5 SHA1 SHA512

Score

10^/10

djvu vidar 517 discovery persistence ransomware spyware stealer suricata

Malware Config

Extracted

Family

vidar

Version

40.4

Botnet

https://romkaxarit.tumblr.com/

Attributes

profile_id
517

Signatures

Detected Djvu ransomeware 6 IoCs

resource	yara_rule
behavioral2/memory/2656-115-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2656-116-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/2656-118-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3744-123-0x0000000000424141-mapping.dmp	family_djvu
behavioral2/memory/3744-125-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/3628-124-0x0000000002800000-0x000000000291B000-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/3108-129-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar
behavioral2/memory/3108-130-0x000000000049ECBD-mapping.dmp	family_vidar
behavioral2/memory/3108-133-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar
behavioral2/memory/1800-132-0x00000000048C0000-0x0000000004993000-memory.dmp	family_vidar

Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
1800	build2.exe
3108	build2.exe

Loads dropped DLL 2 IoCs

pid	Process
3108	build2.exe
3108	build2.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3592	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-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\20151f5f-59ee-4001-96b6-fad28b0e14d9\\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe\" --AutoStart"	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.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 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

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

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2592 set thread context of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 3628 set thread context of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 1800 set thread context of 3108	1800	build2.exe	85

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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2368	timeout.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2308	taskkill.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
3744	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
3744	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe
3108	build2.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2308	taskkill.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2592 wrote to memory of 2656	2592	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	76
PID 2656 wrote to memory of 3592	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	77
PID 2656 wrote to memory of 3592	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	77
PID 2656 wrote to memory of 3592	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	77
PID 2656 wrote to memory of 3628	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	78
PID 2656 wrote to memory of 3628	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	78
PID 2656 wrote to memory of 3628	2656	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	78
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3628 wrote to memory of 3744	3628	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	80
PID 3744 wrote to memory of 1800	3744	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	84
PID 3744 wrote to memory of 1800	3744	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	84
PID 3744 wrote to memory of 1800	3744	3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe	84
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 1800 wrote to memory of 3108	1800	build2.exe	85
PID 3108 wrote to memory of 3264	3108	build2.exe	86
PID 3108 wrote to memory of 3264	3108	build2.exe	86
PID 3108 wrote to memory of 3264	3108	build2.exe	86
PID 3264 wrote to memory of 2308	3264	cmd.exe	88
PID 3264 wrote to memory of 2308	3264	cmd.exe	88
PID 3264 wrote to memory of 2308	3264	cmd.exe	88
PID 3264 wrote to memory of 2368	3264	cmd.exe	90
PID 3264 wrote to memory of 2368	3264	cmd.exe	90
PID 3264 wrote to memory of 2368	3264	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
"C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2592
- C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
  "C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe"
  2⤵
  - Adds Run key to start application
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2656
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\20151f5f-59ee-4001-96b6-fad28b0e14d9" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3592
- - C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
    "C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3628
  - - C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe
      "C:\Users\Admin\AppData\Local\Temp\3a3c73c139d12addf585756334a51fb8ca6381a27531c67ba306923a08fbb05e.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:3744
    - - C:\Users\Admin\AppData\Local\98456b0a-fdbf-4e30-84f0-810c3ad4af4b\build2.exe
        
        "C:\Users\Admin\AppData\Local\98456b0a-fdbf-4e30-84f0-810c3ad4af4b\build2.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:1800
      - C:\Users\Admin\AppData\Local\98456b0a-fdbf-4e30-84f0-810c3ad4af4b\build2.exe
        
        "C:\Users\Admin\AppData\Local\98456b0a-fdbf-4e30-84f0-810c3ad4af4b\build2.exe"
        6⤵
        Executes dropped EXE
        Loads dropped DLL
        Checks processor information in registry
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:3108
        
        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\98456b0a-fdbf-4e30-84f0-810c3ad4af4b\build2.exe" & del C:\ProgramData\*.dll & exit
        7⤵
        Suspicious use of WriteProcessMemory
        
        PID:3264
        
        C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im build2.exe /f
        8⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2308
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 6
        8⤵
        Delays execution with timeout.exe
        
        PID:2368

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

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/1800-132-0x00000000048C0000-0x0000000004993000-memory.dmp

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memory/2592-117-0x0000000002560000-0x00000000026AA000-memory.dmp

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memory/2656-115-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2656-118-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3108-133-0x0000000000400000-0x00000000004D7000-memory.dmp

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memory/3108-129-0x0000000000400000-0x00000000004D7000-memory.dmp

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memory/3628-124-0x0000000002800000-0x000000000291B000-memory.dmp

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memory/3744-125-0x0000000000400000-0x0000000000537000-memory.dmp

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