vidar | ca689501b79de8430f0900c86e9a6b5c93b2d7cc68bc0b8921bb6ebb005f6893

Analysis

max time kernel
46s
max time network
45s
platform
windows7_x64
resource
win7v20201028
submitted
02/02/2021, 15:59

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General

Target
349d7550b23a5c3051faa6981cbead3f.exe
Size 541KB
Sample210202-yfa667aare
SHA256 ca689501b79de8430f0900c86e9a6b5c93b2d7cc68bc0b8921bb6ebb005f6893
MD5 349d7550b23a5c3051faa6981cbead3f
SHA1 3f9c5bcad2f590360be7896ba0041e47b4557f6b
SHA512 0371c22293785d230748d59b327e9e155d89255b6b2b85f9840279fb7c75f6ef12809d6d816786bbfe5946d0ce69ec581681a9fec4a2d141db1d72fc84b131b4
MD5 SHA1 SHA512

Score

10^/10

vidar discovery ransomware spyware stealer

Malware Config

Signatures

Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar

Deletes itself 1 IoCs

pid	Process
816	cmd.exe

Loads dropped DLL 4 IoCs

pid	Process
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

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
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

JavaScript code in executable 1 IoCs

resource	yara_rule
behavioral1/files/0x00030000000130ef-4.dat	js

Looks up external IP address via web service 1 IoCs

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

flow	ioc
8	ip-api.com

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

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	349d7550b23a5c3051faa6981cbead3f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	349d7550b23a5c3051faa6981cbead3f.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1516	taskkill.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe
2044	349d7550b23a5c3051faa6981cbead3f.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1516	taskkill.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 816	2044	349d7550b23a5c3051faa6981cbead3f.exe	31
PID 2044 wrote to memory of 816	2044	349d7550b23a5c3051faa6981cbead3f.exe	31
PID 2044 wrote to memory of 816	2044	349d7550b23a5c3051faa6981cbead3f.exe	31
PID 2044 wrote to memory of 816	2044	349d7550b23a5c3051faa6981cbead3f.exe	31
PID 816 wrote to memory of 1516	816	cmd.exe	33
PID 816 wrote to memory of 1516	816	cmd.exe	33
PID 816 wrote to memory of 1516	816	cmd.exe	33
PID 816 wrote to memory of 1516	816	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\349d7550b23a5c3051faa6981cbead3f.exe
"C:\Users\Admin\AppData\Local\Temp\349d7550b23a5c3051faa6981cbead3f.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2044
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /im 349d7550b23a5c3051faa6981cbead3f.exe /f & erase C:\Users\Admin\AppData\Local\Temp\349d7550b23a5c3051faa6981cbead3f.exe & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:816
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /im 349d7550b23a5c3051faa6981cbead3f.exe /f
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1516

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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/1112-3-0x000007FEF6510000-0x000007FEF678A000-memory.dmp

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memory/2044-2-0x0000000075251000-0x0000000075253000-memory.dmp

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