vidar | af7e8bfb4652f62934fa5f2de47582b39d26c2bed1180e0fbb6f8fef3eb7b97e

Analysis

max time kernel
120s
max time network
144s
platform
windows10_x64
resource
win10v20210408
submitted
30/08/2021, 13:15

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General

Target
99f1b11492f7f5b7ed21660f692fb59e.exe
Size 756KB
Sample210830-3x6d89jevn
SHA256 af7e8bfb4652f62934fa5f2de47582b39d26c2bed1180e0fbb6f8fef3eb7b97e
MD5 99f1b11492f7f5b7ed21660f692fb59e
SHA1 717d6d22dd2ed0b1330a0d48befefad46146515b
SHA512 4df93b8a898f273f13582f42e60b6804df89920b8ba6168f13a4c93701b9c01a53fa655e9d5bcbe483104a9674d1d1cd51e8b2f6ef26fe16998eb14b4aeb37d9
MD5 SHA1 SHA512

Score

10^/10

vidar discovery persistence spyware stealer suricata

Malware Config

Signatures

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 5 IoCs

stealer

resource	yara_rule
behavioral2/memory/3240-129-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar
behavioral2/memory/3240-130-0x000000000049ECBD-mapping.dmp	family_vidar
behavioral2/memory/3240-132-0x0000000000400000-0x00000000004D7000-memory.dmp	family_vidar
behavioral2/memory/736-131-0x0000000003B30000-0x0000000003C03000-memory.dmp	family_vidar
behavioral2/memory/4000-154-0x0000000003250000-0x00000000032FE000-memory.dmp	family_vidar

Downloads MZ/PE file

Executes dropped EXE 4 IoCs

pid	Process
4000	mstsca.exe
2088	mstsca.exe
1988	mstsca.exe
2644	mstsca.exe

Loads dropped DLL 2 IoCs

pid	Process
3240	build2.exe
3240	build2.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3296	icacls.exe

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-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\a262d341-46db-411d-9f56-3e0ceb7331b8\\99f1b11492f7f5b7ed21660f692fb59e.exe\" --AutoStart"	99f1b11492f7f5b7ed21660f692fb59e.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
10	api.2ip.ua
11	api.2ip.ua
22	api.2ip.ua

Suspicious use of SetThreadContext 6 IoCs

description	pid	Process	procid_target
PID 632 set thread context of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 2120 set thread context of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2772 set thread context of 4052	2772	build3.exe	85
PID 736 set thread context of 3240	736	build2.exe	88
PID 4000 set thread context of 2088	4000	mstsca.exe	95
PID 1988 set thread context of 2644	1988	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

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

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
192	schtasks.exe
2080	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1328	timeout.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
640	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	99f1b11492f7f5b7ed21660f692fb59e.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	99f1b11492f7f5b7ed21660f692fb59e.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
500	99f1b11492f7f5b7ed21660f692fb59e.exe
500	99f1b11492f7f5b7ed21660f692fb59e.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe
3240	build2.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	640	taskkill.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 632 wrote to memory of 500	632	99f1b11492f7f5b7ed21660f692fb59e.exe	75
PID 500 wrote to memory of 3296	500	99f1b11492f7f5b7ed21660f692fb59e.exe	78
PID 500 wrote to memory of 3296	500	99f1b11492f7f5b7ed21660f692fb59e.exe	78
PID 500 wrote to memory of 3296	500	99f1b11492f7f5b7ed21660f692fb59e.exe	78
PID 500 wrote to memory of 2120	500	99f1b11492f7f5b7ed21660f692fb59e.exe	79
PID 500 wrote to memory of 2120	500	99f1b11492f7f5b7ed21660f692fb59e.exe	79
PID 500 wrote to memory of 2120	500	99f1b11492f7f5b7ed21660f692fb59e.exe	79
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2120 wrote to memory of 3548	2120	99f1b11492f7f5b7ed21660f692fb59e.exe	81
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 2772 wrote to memory of 4052	2772	build3.exe	85
PID 4052 wrote to memory of 192	4052	build3.exe	86
PID 4052 wrote to memory of 192	4052	build3.exe	86
PID 4052 wrote to memory of 192	4052	build3.exe	86
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 736 wrote to memory of 3240	736	build2.exe	88
PID 3240 wrote to memory of 3296	3240	build2.exe	89
PID 3240 wrote to memory of 3296	3240	build2.exe	89
PID 3240 wrote to memory of 3296	3240	build2.exe	89
PID 3296 wrote to memory of 640	3296	cmd.exe	91
PID 3296 wrote to memory of 640	3296	cmd.exe	91
PID 3296 wrote to memory of 640	3296	cmd.exe	91
PID 3296 wrote to memory of 1328	3296	cmd.exe	93
PID 3296 wrote to memory of 1328	3296	cmd.exe	93
PID 3296 wrote to memory of 1328	3296	cmd.exe	93
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95
PID 4000 wrote to memory of 2088	4000	mstsca.exe	95

C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe
"C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:632
- C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe
  "C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe"
  2⤵
  - Adds Run key to start application
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:500
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\a262d341-46db-411d-9f56-3e0ceb7331b8" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:3296
- - C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe
    "C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:2120
  - - C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe
      "C:\Users\Admin\AppData\Local\Temp\99f1b11492f7f5b7ed21660f692fb59e.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      PID:3548
    - - C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build2.exe
        
        "C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build2.exe"
        5⤵
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:736
      - C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build2.exe
        
        "C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build2.exe"
        6⤵
        Loads dropped DLL
        Checks processor information in registry
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of WriteProcessMemory
        
        PID:3240
        
        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\1d228082-31c3-4451-8be7-b08d2aafaae6\build2.exe" & del C:\ProgramData\*.dll & exit
        7⤵
        Suspicious use of WriteProcessMemory
        
        PID:3296
        
        C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im build2.exe /f
        8⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:640
        
        C:\Windows\SysWOW64\timeout.exe
        
        timeout /t 6
        8⤵
        Delays execution with timeout.exe
        
        PID:1328
    - - C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build3.exe
        
        "C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build3.exe"
        5⤵
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:2772
      - C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build3.exe
        
        "C:\Users\Admin\AppData\Local\1d228082-31c3-4451-8be7-b08d2aafaae6\build3.exe"
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:4052
        
        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:192

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:4000
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  PID:2088
- - 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:2080

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:1988
- C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
  2⤵
  - Executes dropped EXE
  PID:2644

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

Replay Monitor

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Downloads

memory/500-117-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/500-115-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/632-114-0x0000000003CF0000-0x0000000003E0B000-memory.dmp

Download

memory/736-131-0x0000000003B30000-0x0000000003C03000-memory.dmp

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memory/2772-127-0x00000000032A0000-0x00000000032A4000-memory.dmp

Download

memory/3240-132-0x0000000000400000-0x00000000004D7000-memory.dmp

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memory/3240-129-0x0000000000400000-0x00000000004D7000-memory.dmp

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memory/3548-123-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4000-154-0x0000000003250000-0x00000000032FE000-memory.dmp

Download

memory/4052-128-0x0000000000400000-0x0000000000406000-memory.dmp

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memory/4052-124-0x0000000000400000-0x0000000000406000-memory.dmp

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