oski | cd986b32c220cc04c9feb5e42a393fb34efc884d176e6d8d266e54ac4840cfa3

Analysis

max time kernel
29s
max time network
30s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
16/05/2024, 17:48

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General

Target
Oski Cracked.exe
Size 4.5MB
Sample240516-wdvlaage36
SHA256 cd986b32c220cc04c9feb5e42a393fb34efc884d176e6d8d266e54ac4840cfa3
MD5 a52baa5b64635eec7c7b888bff016aac
SHA1 a86b895b483df3c657553f498ebcd9c97b89415f
SHA512 bed140ed03ed4b5da82edf1139eced7c84a56fe75f5a8926002414ed0b8f25fbb6cbf9e3111ff6d9b5d942382be331a674f17cf10b2150f171f32276ad4b3980
SSDEEP 98304:iJCbuSMburCaMZh0yEKj+WRvrY1dcZ048HV/bFy8jJ7APB:8mMbuQZlFY7KsZPNA
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

oski quasar venomrat vilva v3 evasion infostealer rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

VILVA V3

67.213.221.18:7812

Mutex

VNM_MUTEX_DR6NAzaayWgRGuLNpp

Attributes

encryption_key
izGdDJVzqIzRDlXcooB4
install_name
Windows Defender Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Service
subdirectory
WindowsDir

Signatures

Contains code to disable Windows Defender 3 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/files/0x000c00000001226d-5.dat	disable_win_def
behavioral2/memory/2564-20-0x0000000000F60000-0x0000000000FEC000-memory.dmp	disable_win_def
behavioral2/memory/2532-28-0x0000000000180000-0x000000000020C000-memory.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	Windows Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	Windows Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	Windows Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	Windows Security.exe

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/files/0x000c00000001226d-5.dat	family_quasar
behavioral2/memory/2564-20-0x0000000000F60000-0x0000000000FEC000-memory.dmp	family_quasar
behavioral2/memory/2532-28-0x0000000000180000-0x000000000020C000-memory.dmp	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat

Deletes itself 1 IoCs

pid	Process
2800	cmd.exe

Executes dropped EXE 3 IoCs

pid	Process
2564	Windows Security.exe
2692	Oski Cracked.exe
2532	Windows Defender Security.exe

Loads dropped DLL 3 IoCs

pid	Process
1904	Oski Cracked.exe
1904	Oski Cracked.exe
2564	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	Windows Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Windows Security.exe

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
2	ip-api.com

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

System Information Discovery
T1082

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/Job

T1053

pid	Process
2472	schtasks.exe
2516	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
572	PING.EXE

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2964	powershell.exe
2564	Windows Security.exe
2564	Windows Security.exe
2564	Windows Security.exe
2564	Windows Security.exe
2564	Windows Security.exe
2564	Windows Security.exe
2564	Windows Security.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2564	Windows Security.exe
Token: SeDebugPrivilege	2532	Windows Defender Security.exe
Token: SeDebugPrivilege	2964	powershell.exe
Token: SeDebugPrivilege	2532	Windows Defender Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2532	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 44 IoCs

description	pid	Process	procid_target
PID 1904 wrote to memory of 2564	1904	Oski Cracked.exe	28
PID 1904 wrote to memory of 2564	1904	Oski Cracked.exe	28
PID 1904 wrote to memory of 2564	1904	Oski Cracked.exe	28
PID 1904 wrote to memory of 2564	1904	Oski Cracked.exe	28
PID 1904 wrote to memory of 2692	1904	Oski Cracked.exe	29
PID 1904 wrote to memory of 2692	1904	Oski Cracked.exe	29
PID 1904 wrote to memory of 2692	1904	Oski Cracked.exe	29
PID 1904 wrote to memory of 2692	1904	Oski Cracked.exe	29
PID 2564 wrote to memory of 2472	2564	Windows Security.exe	31
PID 2564 wrote to memory of 2472	2564	Windows Security.exe	31
PID 2564 wrote to memory of 2472	2564	Windows Security.exe	31
PID 2564 wrote to memory of 2472	2564	Windows Security.exe	31
PID 2564 wrote to memory of 2532	2564	Windows Security.exe	33
PID 2564 wrote to memory of 2532	2564	Windows Security.exe	33
PID 2564 wrote to memory of 2532	2564	Windows Security.exe	33
PID 2564 wrote to memory of 2532	2564	Windows Security.exe	33
PID 2564 wrote to memory of 2964	2564	Windows Security.exe	34
PID 2564 wrote to memory of 2964	2564	Windows Security.exe	34
PID 2564 wrote to memory of 2964	2564	Windows Security.exe	34
PID 2564 wrote to memory of 2964	2564	Windows Security.exe	34
PID 2532 wrote to memory of 2516	2532	Windows Defender Security.exe	36
PID 2532 wrote to memory of 2516	2532	Windows Defender Security.exe	36
PID 2532 wrote to memory of 2516	2532	Windows Defender Security.exe	36
PID 2532 wrote to memory of 2516	2532	Windows Defender Security.exe	36
PID 2564 wrote to memory of 1220	2564	Windows Security.exe	38
PID 2564 wrote to memory of 1220	2564	Windows Security.exe	38
PID 2564 wrote to memory of 1220	2564	Windows Security.exe	38
PID 2564 wrote to memory of 1220	2564	Windows Security.exe	38
PID 1220 wrote to memory of 2800	1220	cmd.exe	40
PID 1220 wrote to memory of 2800	1220	cmd.exe	40
PID 1220 wrote to memory of 2800	1220	cmd.exe	40
PID 1220 wrote to memory of 2800	1220	cmd.exe	40
PID 2564 wrote to memory of 320	2564	Windows Security.exe	41
PID 2564 wrote to memory of 320	2564	Windows Security.exe	41
PID 2564 wrote to memory of 320	2564	Windows Security.exe	41
PID 2564 wrote to memory of 320	2564	Windows Security.exe	41
PID 320 wrote to memory of 688	320	cmd.exe	43
PID 320 wrote to memory of 688	320	cmd.exe	43
PID 320 wrote to memory of 688	320	cmd.exe	43
PID 320 wrote to memory of 688	320	cmd.exe	43
PID 320 wrote to memory of 572	320	cmd.exe	44
PID 320 wrote to memory of 572	320	cmd.exe	44
PID 320 wrote to memory of 572	320	cmd.exe	44
PID 320 wrote to memory of 572	320	cmd.exe	44

C:\Users\Admin\AppData\Local\Temp\Oski Cracked.exe
"C:\Users\Admin\AppData\Local\Temp\Oski Cracked.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1904
- C:\Users\Admin\AppData\Roaming\Windows Security.exe
  "C:\Users\Admin\AppData\Roaming\Windows Security.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Executes dropped EXE
  - Loads dropped DLL
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Security.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2472
- - C:\Users\Admin\AppData\Roaming\WindowsDir\Windows Defender Security.exe
    "C:\Users\Admin\AppData\Roaming\WindowsDir\Windows Defender Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2532
  - - C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Windows Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\WindowsDir\Windows Defender Security.exe" /rl HIGHEST /f
      4⤵
      Creates scheduled task(s)
      PID:2516
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2964
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1220
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      Deletes itself
      PID:2800
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\2VL5Nhgo6D4j.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:320
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:688
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      Runs ping.exe
      PID:572
- C:\Users\Admin\AppData\Roaming\Oski Cracked.exe
  "C:\Users\Admin\AppData\Roaming\Oski Cracked.exe"
  2⤵
  - Executes dropped EXE
  PID:2692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

2VL5Nhgo6D4j.bat

Path C:\Users\Admin\AppData\Local\Temp\2VL5Nhgo6D4j.bat
Size 210B
SHA256 86b2a93cc0e03973315d3afb3bc930e20389620503a625d3e62a2d2b3c3cccee
MD5 522b6ee74dcb8828f10179e87aa4d360
SHA1 c5dca1b0814ea055451ef929e24a5a42ed22551c
SHA512 91207797bafa6b92cb27afc9eb1bb4756e5f1a83ed5de67c80c9f95a0934534f20efd49ba934f02d2eaa3d7c8569e80e704dbaeec4d042d01b5a5fbbf03dbfd3
MD5 SHA1 SHA512

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Cab34B9.tmp

Path C:\Users\Admin\AppData\Local\Temp\Cab34B9.tmp
Size 68KB
SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
MD5 29f65ba8e88c063813cc50a4ea544e93
SHA1 05a7040d5c127e68c25d81cc51271ffb8bef3568
SHA512 e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa
SSDEEP 1536:iMveRG6BWC7T2g1wGUa5QUoaIB9ttiFJG+AOQOXl0Usvwr:feRG6BX6gUaHo9tkBHiUewr
MD5 SHA1 SHA512 SSDEEP

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Tar34DB.tmp

Path C:\Users\Admin\AppData\Local\Temp\Tar34DB.tmp
Size 177KB
SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
MD5 435a9ac180383f9fa094131b173a2f7b
SHA1 76944ea657a9db94f9a4bef38f88c46ed4166983
SHA512 1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a
SSDEEP 1536:fAo/J+lCUsTRvsqgCyqWlUDNWdm1wpSru2A0XwjY/z02DTr3rmt6mJ:f/J+qTR0XCy/dmASru2Aijbdq
MD5 SHA1 SHA512 SSDEEP

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Oski Cracked.exe

Path \Users\Admin\AppData\Roaming\Oski Cracked.exe
Size 3.9MB
SHA256 71efc8fc1dede4f96e837043ad3cbd38a65bd530ce71ae4d44ddc29843fab70b
MD5 2bd0e61c45d352697c5e16437d8055b0
SHA1 0b9b24d396a50c2dc13d73e1f2d57c1891de3f31
SHA512 80044d4ece73637328e9b456c3127be02ecc9cea4b12fee65a884fed0266187aec58e6906c652face3b6125d59b9fa10303f02e1d8bfa33dbccb62fd2bc2b73d
SSDEEP 98304:EJCbuSMburCaMZh0yEKj+WRvrY1dcZ048HV/bFy8jJ7:mmMbuQZlFY7KsZPN
MD5 SHA1 SHA512 SSDEEP

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Windows Security.exe

Path \Users\Admin\AppData\Roaming\Windows Security.exe
Size 534KB
SHA256 401d7686d9400875f1ee068006e7142c1bdc1108d4ddb3113924dddb312be7d5
MD5 deb0b7c057e00267baf93d2be0fd5e9f
SHA1 0938426efa7763dde948ce903b46bc88c7f8bf04
SHA512 e9d5986b49339fb99703d34743fec5a6522e4c2d05a81a818d58c9f15a1144d338058ebdb3076f5a683cd5bf03d01ac50156f2063450d4955f7cf854b2d1869e
SSDEEP 6144:X8fG1BIgrx8kFYLTiMkbFI6tNF2ADY5LTQC/CRL3bPOhvJSfJK1EWeMJu5X90GyD:7Px7FYPiM6Y0Y5LkC/2+ihiEmqXfo
MD5 SHA1 SHA512 SSDEEP

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memory/1904-0-0x0000000074211000-0x0000000074212000-memory.dmp

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memory/1904-16-0x0000000074210000-0x00000000747BB000-memory.dmp

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memory/1904-1-0x0000000074210000-0x00000000747BB000-memory.dmp

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memory/1904-3-0x0000000074210000-0x00000000747BB000-memory.dmp

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memory/2532-28-0x0000000000180000-0x000000000020C000-memory.dmp

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memory/2564-20-0x0000000000F60000-0x0000000000FEC000-memory.dmp

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memory/2564-85-0x000000007211E000-0x000000007211F000-memory.dmp

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memory/2564-17-0x000000007211E000-0x000000007211F000-memory.dmp

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memory/2692-32-0x000000001B500000-0x000000001B91C000-memory.dmp

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memory/2692-19-0x0000000000A80000-0x0000000000E76000-memory.dmp

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memory/2692-18-0x000007FEF52F3000-0x000007FEF52F4000-memory.dmp

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memory/2692-86-0x000007FEF52F3000-0x000007FEF52F4000-memory.dmp

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