vidar | dc6f024b81983ce22d883ccc346b3888d984e360196b3e472c1cce3f79b70fa0

Analysis

max time kernel
139s
max time network
135s
platform
windows10_x64
resource
win10v20210410
submitted
04/08/2021, 13:43

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General

Target
540b4b9c6afd6d88d93ea8700c287fac.exe
Size 729KB
Sample210804-byhf4abtps
SHA256 dc6f024b81983ce22d883ccc346b3888d984e360196b3e472c1cce3f79b70fa0
MD5 540b4b9c6afd6d88d93ea8700c287fac
SHA1 5762839b7403d82363c8a5625f8f811425f9f1c5
SHA512 d051e1dcad30e3add94e189a3869b7b8c43e6bf41dc7515114706e8f691d2d66027be6ef733bf429a801a91cfb6d4c848219d65e241d07cc28eecb9e80447660
MD5 SHA1 SHA512

Score

10^/10

vidar 517 discovery persistence stealer suricata

Malware Config

Extracted

Family

vidar

Version

39.9

Botnet

https://prophefliloc.tumblr.com/

Attributes

profile_id
517

Signatures

Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata

Vidar Stealer 6 IoCs

stealer

resource	yara_rule
behavioral2/memory/3928-134-0x0000000000400000-0x00000000004A1000-memory.dmp	family_vidar
behavioral2/memory/3928-135-0x000000000046B77D-mapping.dmp	family_vidar
behavioral2/memory/1740-141-0x0000000004920000-0x00000000049BE000-memory.dmp	family_vidar
behavioral2/memory/3928-143-0x0000000000400000-0x00000000004A1000-memory.dmp	family_vidar
behavioral2/memory/2472-151-0x00000000032A0000-0x00000000033EA000-memory.dmp	family_vidar
behavioral2/memory/3460-160-0x0000000003250000-0x00000000032FE000-memory.dmp	family_vidar

Downloads MZ/PE file

Executes dropped EXE 10 IoCs

pid	Process
1740	build2.exe
928	build3.exe
3928	build2.exe
4032	build3.exe
2472	mstsca.exe
1400	mstsca.exe
2812	mstsca.exe
2760	mstsca.exe
3460	mstsca.exe
2788	mstsca.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3356	icacls.exe

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-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\e43f7ba1-791b-493d-bb38-9b3946b1915a\\540b4b9c6afd6d88d93ea8700c287fac.exe\" --AutoStart"	540b4b9c6afd6d88d93ea8700c287fac.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
12	api.2ip.ua
13	api.2ip.ua
20	api.2ip.ua

Suspicious use of SetThreadContext 7 IoCs

description	pid	Process	procid_target
PID 680 set thread context of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 2040 set thread context of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 1740 set thread context of 3928	1740	build2.exe	86
PID 928 set thread context of 4032	928	build3.exe	87
PID 2472 set thread context of 1400	2472	mstsca.exe	91
PID 2812 set thread context of 2760	2812	mstsca.exe	97
PID 3460 set thread context of 2788	3460	mstsca.exe	99

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1316	3928	WerFault.exe	86

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
3992	schtasks.exe
652	schtasks.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	540b4b9c6afd6d88d93ea8700c287fac.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	540b4b9c6afd6d88d93ea8700c287fac.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
2804	540b4b9c6afd6d88d93ea8700c287fac.exe
2804	540b4b9c6afd6d88d93ea8700c287fac.exe
3848	540b4b9c6afd6d88d93ea8700c287fac.exe
3848	540b4b9c6afd6d88d93ea8700c287fac.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe
1316	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	1316	WerFault.exe
Token: SeBackupPrivilege	1316	WerFault.exe
Token: SeDebugPrivilege	1316	WerFault.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 680 wrote to memory of 2804	680	540b4b9c6afd6d88d93ea8700c287fac.exe	76
PID 2804 wrote to memory of 3356	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	77
PID 2804 wrote to memory of 3356	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	77
PID 2804 wrote to memory of 3356	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	77
PID 2804 wrote to memory of 2040	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	80
PID 2804 wrote to memory of 2040	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	80
PID 2804 wrote to memory of 2040	2804	540b4b9c6afd6d88d93ea8700c287fac.exe	80
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 2040 wrote to memory of 3848	2040	540b4b9c6afd6d88d93ea8700c287fac.exe	82
PID 3848 wrote to memory of 1740	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	83
PID 3848 wrote to memory of 1740	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	83
PID 3848 wrote to memory of 1740	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	83
PID 3848 wrote to memory of 928	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	85
PID 3848 wrote to memory of 928	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	85
PID 3848 wrote to memory of 928	3848	540b4b9c6afd6d88d93ea8700c287fac.exe	85
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 1740 wrote to memory of 3928	1740	build2.exe	86
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 928 wrote to memory of 4032	928	build3.exe	87
PID 4032 wrote to memory of 3992	4032	build3.exe	88
PID 4032 wrote to memory of 3992	4032	build3.exe	88
PID 4032 wrote to memory of 3992	4032	build3.exe	88
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 2472 wrote to memory of 1400	2472	mstsca.exe	91
PID 1400 wrote to memory of 652	1400	mstsca.exe	92
PID 1400 wrote to memory of 652	1400	mstsca.exe	92
PID 1400 wrote to memory of 652	1400	mstsca.exe	92

C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe
"C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:680
- C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe
  "C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe"
  2⤵
  - Adds Run key to start application
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2804
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\e43f7ba1-791b-493d-bb38-9b3946b1915a" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3356
- - C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe
    "C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:2040
  - - C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe
      "C:\Users\Admin\AppData\Local\Temp\540b4b9c6afd6d88d93ea8700c287fac.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:3848
    - - C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build2.exe
        
        "C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build2.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:1740
      - C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build2.exe
        
        "C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build2.exe"
        6⤵
        Executes dropped EXE
        
        PID:3928
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3928 -s 1064
        7⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1316
    - - C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build3.exe
        
        "C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build3.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:928
      - C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build3.exe
        
        "C:\Users\Admin\AppData\Local\ffe560cb-681d-41a0-aece-aaf52cee14b3\build3.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of WriteProcessMemory
        
        PID:4032
        
        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:3992

C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2472
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1400
- - 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"
    3⤵
    - Creates scheduled task(s)
    PID:652

C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:2812
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  PID:2760

C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:3460
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  PID:2788

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

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/680-118-0x00000000049A0000-0x0000000004ABB000-memory.dmp

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memory/928-142-0x00000000032A0000-0x00000000032A4000-memory.dmp

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memory/1740-141-0x0000000004920000-0x00000000049BE000-memory.dmp

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memory/2472-151-0x00000000032A0000-0x00000000033EA000-memory.dmp

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memory/2804-114-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2804-119-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3460-160-0x0000000003250000-0x00000000032FE000-memory.dmp

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memory/3848-127-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3928-134-0x0000000000400000-0x00000000004A1000-memory.dmp

Download

memory/3928-143-0x0000000000400000-0x00000000004A1000-memory.dmp

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memory/4032-137-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/4032-144-0x0000000000400000-0x0000000000406000-memory.dmp

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