quasar | 8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34

Analysis

max time kernel
145s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
25/11/2022, 08:51

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General

Target
8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe
Size 611KB
Sample221125-kshpgsaa8z
SHA256 8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34
MD5 cc65b79bc0887658e9c592071bf8cb91
SHA1 a45592c19ed3c8579972c7c7e19ba01af2894348
SHA512 0f0155a099487c91485b1df911fdbc4ae00fbbcd9ce48954daffadfe72247dc3d1f1af58d41081216a8977f43d277eb6578d8d4f04dceae32a361168c288b719
SSDEEP 6144:4iBZTVvvVDzRW1BHH3g1NWT+AKYEM+gW4SmSMX0zCVsVwX+v456/Z9ZGoaEKwa/W:4AZTVXFRW1ZpK2bNV0Cgwu/ZGmkAh
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar venomrat rat evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

23.105.131.178:7812

Mutex

VNM_MUTEX_It9SqdFDNndEItXfKp

Attributes

encryption_key
txgQXKaATimN7DY8jnPH
install_name
Windows Defender Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
Microsoft

Signatures

Contains code to disable Windows Defender 6 IoCs

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

resource	yara_rule
behavioral2/files/0x0006000000022e48-134.dat	disable_win_def
behavioral2/files/0x0006000000022e48-135.dat	disable_win_def
behavioral2/memory/4772-137-0x0000000000D20000-0x0000000000DAC000-memory.dmp	disable_win_def
behavioral2/files/0x0007000000022e45-145.dat	disable_win_def
behavioral2/files/0x0007000000022e45-146.dat	disable_win_def
behavioral2/files/0x0006000000022e48-172.dat	disable_win_def

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

evasion trojan

Modify Registry

T1112

Modify Existing Service

T1031

Disabling Security Tools

T1089

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	Windows Defender Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	Windows Defender Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	Windows Defender Security.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	Windows Defender Security.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 6 IoCs

resource	yara_rule
behavioral2/files/0x0006000000022e48-134.dat	family_quasar
behavioral2/files/0x0006000000022e48-135.dat	family_quasar
behavioral2/memory/4772-137-0x0000000000D20000-0x0000000000DAC000-memory.dmp	family_quasar
behavioral2/files/0x0007000000022e45-145.dat	family_quasar
behavioral2/files/0x0007000000022e45-146.dat	family_quasar
behavioral2/files/0x0006000000022e48-172.dat	family_quasar

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

Executes dropped EXE 3 IoCs

pid	Process
4772	Windows Defender Security.exe
4544	Windows Defender Security.exe
1124	Windows Defender Security.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	Windows Defender Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Windows Defender Security.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	Windows Defender Security.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-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows Defender Security.exe\""	Windows Defender Security.exe

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
17	ip-api.com
28	api.ipify.org

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

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

T1053

pid	Process
3332	schtasks.exe
4768	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1164	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1068	powershell.exe
1068	powershell.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
4772	Windows Defender Security.exe
1124	Windows Defender Security.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4772	Windows Defender Security.exe
Token: SeDebugPrivilege	1068	powershell.exe
Token: SeDebugPrivilege	4544	Windows Defender Security.exe
Token: SeDebugPrivilege	4544	Windows Defender Security.exe
Token: SeDebugPrivilege	1124	Windows Defender Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4544	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4636 wrote to memory of 4772	4636	8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe	81
PID 4636 wrote to memory of 4772	4636	8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe	81
PID 4636 wrote to memory of 4772	4636	8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe	81
PID 4772 wrote to memory of 4768	4772	Windows Defender Security.exe	82
PID 4772 wrote to memory of 4768	4772	Windows Defender Security.exe	82
PID 4772 wrote to memory of 4768	4772	Windows Defender Security.exe	82
PID 4772 wrote to memory of 4544	4772	Windows Defender Security.exe	84
PID 4772 wrote to memory of 4544	4772	Windows Defender Security.exe	84
PID 4772 wrote to memory of 4544	4772	Windows Defender Security.exe	84
PID 4772 wrote to memory of 1068	4772	Windows Defender Security.exe	85
PID 4772 wrote to memory of 1068	4772	Windows Defender Security.exe	85
PID 4772 wrote to memory of 1068	4772	Windows Defender Security.exe	85
PID 4772 wrote to memory of 3068	4772	Windows Defender Security.exe	88
PID 4772 wrote to memory of 3068	4772	Windows Defender Security.exe	88
PID 4772 wrote to memory of 3068	4772	Windows Defender Security.exe	88
PID 3068 wrote to memory of 3652	3068	cmd.exe	90
PID 3068 wrote to memory of 3652	3068	cmd.exe	90
PID 3068 wrote to memory of 3652	3068	cmd.exe	90
PID 4544 wrote to memory of 3332	4544	Windows Defender Security.exe	91
PID 4544 wrote to memory of 3332	4544	Windows Defender Security.exe	91
PID 4544 wrote to memory of 3332	4544	Windows Defender Security.exe	91
PID 4772 wrote to memory of 4532	4772	Windows Defender Security.exe	93
PID 4772 wrote to memory of 4532	4772	Windows Defender Security.exe	93
PID 4772 wrote to memory of 4532	4772	Windows Defender Security.exe	93
PID 4532 wrote to memory of 2112	4532	cmd.exe	95
PID 4532 wrote to memory of 2112	4532	cmd.exe	95
PID 4532 wrote to memory of 2112	4532	cmd.exe	95
PID 4532 wrote to memory of 1164	4532	cmd.exe	96
PID 4532 wrote to memory of 1164	4532	cmd.exe	96
PID 4532 wrote to memory of 1164	4532	cmd.exe	96
PID 4532 wrote to memory of 1124	4532	cmd.exe	101
PID 4532 wrote to memory of 1124	4532	cmd.exe	101
PID 4532 wrote to memory of 1124	4532	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe
"C:\Users\Admin\AppData\Local\Temp\8355ecc5bf7aaff778180863fee588adf6fdc1cb12062c021109a1ec1f130b34.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4636
- C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
  "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Executes dropped EXE
  - Checks computer location settings
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4772
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4768
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4544
  - - C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe" /rl HIGHEST /f
      4⤵
      Creates scheduled task(s)
      PID:3332
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1068
- - 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:3068
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:3652
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\63QINACbFgAU.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4532
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:2112
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      Runs ping.exe
      PID:1164
  - - C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
      "C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1124

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Windows Defender Security.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Defender Security.exe.log
Size 1KB
SHA256 f49dbd55029bfbc15134f7c6a4f967d6c39142c63f2e8f1f8c78fab108a2c928
MD5 10eab9c2684febb5327b6976f2047587
SHA1 a12ed54146a7f5c4c580416aecb899549712449e
SHA512 7e5fd90fffae723bd0c662a90e0730b507805f072771ee673d1d8c262dbf60c8a03ba5fe088f699a97c2e886380de158b2ccd59ee62e3d012dd6dd14ea9d0e50
MD5 SHA1 SHA512

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63QINACbFgAU.bat

Path C:\Users\Admin\AppData\Local\Temp\63QINACbFgAU.bat
Size 219B
SHA256 948a2cf3f68af806a18a49bab1143fc84671fe10047444dfedf84b173720c43a
MD5 99d2674d26c25908b5cd64b0588f002f
SHA1 b6ab6965a606862767ea9afd22c412000dd18995
SHA512 7d11ad1cdcbf8eb1044aeab7b5a058ac76127c55a7c06067b2d4a1ca56fd2389cc9cbeea5bb8bce6ad200482a4a1ca8a4bd56e99c5df8f45eeffd9958621ad81
MD5 SHA1 SHA512

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe
Size 535KB
SHA256 026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176
MD5 0bd3018c9c566328497be54c7d882159
SHA1 8d90c23ee373ab935ba930f25c96374762c4a5a6
SHA512 90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc
SSDEEP 12288:rPx7FYPiMHbFnVlfMLIMHA5J4x/6Q5CMBS3fnT:rZiPiMHZVdMECxJ5kT
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows Defender Security.exe
Size 535KB
SHA256 026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176
MD5 0bd3018c9c566328497be54c7d882159
SHA1 8d90c23ee373ab935ba930f25c96374762c4a5a6
SHA512 90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc
SSDEEP 12288:rPx7FYPiMHbFnVlfMLIMHA5J4x/6Q5CMBS3fnT:rZiPiMHZVdMECxJ5kT
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
Size 535KB
SHA256 026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176
MD5 0bd3018c9c566328497be54c7d882159
SHA1 8d90c23ee373ab935ba930f25c96374762c4a5a6
SHA512 90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc
SSDEEP 12288:rPx7FYPiMHbFnVlfMLIMHA5J4x/6Q5CMBS3fnT:rZiPiMHZVdMECxJ5kT
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
Size 535KB
SHA256 026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176
MD5 0bd3018c9c566328497be54c7d882159
SHA1 8d90c23ee373ab935ba930f25c96374762c4a5a6
SHA512 90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc
SSDEEP 12288:rPx7FYPiMHbFnVlfMLIMHA5J4x/6Q5CMBS3fnT:rZiPiMHZVdMECxJ5kT
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\Windows Defender Security.exe
Size 535KB
SHA256 026971c3fba531247627dd9f3f7d51c566d8df28a52332bd3d0eb8ca55d96176
MD5 0bd3018c9c566328497be54c7d882159
SHA1 8d90c23ee373ab935ba930f25c96374762c4a5a6
SHA512 90cfde84ae14de5151c4950b8f8fe05d108a9716f3e0c104e2793a9c8bbb6a4385fe24a1bd9bc020cd061a128bb258ef44ef8679ac4b0e8a280107b22ed9e8cc
SSDEEP 12288:rPx7FYPiMHbFnVlfMLIMHA5J4x/6Q5CMBS3fnT:rZiPiMHZVdMECxJ5kT
MD5 SHA1 SHA512 SSDEEP

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memory/1068-162-0x00000000071D0000-0x00000000071D8000-memory.dmp

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memory/1068-156-0x00000000074F0000-0x0000000007B6A000-memory.dmp

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memory/1068-161-0x00000000071F0000-0x000000000720A000-memory.dmp

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memory/1068-160-0x00000000070E0000-0x00000000070EE000-memory.dmp

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memory/1068-159-0x0000000007130000-0x00000000071C6000-memory.dmp

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memory/1068-158-0x0000000006F20000-0x0000000006F2A000-memory.dmp

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memory/1068-157-0x0000000006EB0000-0x0000000006ECA000-memory.dmp

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memory/1068-155-0x0000000006B80000-0x0000000006B9E000-memory.dmp

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memory/1068-148-0x0000000002280000-0x00000000022B6000-memory.dmp

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memory/1068-149-0x0000000004E50000-0x0000000005478000-memory.dmp

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memory/1068-150-0x0000000004C70000-0x0000000004C92000-memory.dmp

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memory/1068-151-0x00000000054F0000-0x0000000005556000-memory.dmp

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memory/1068-152-0x0000000005BB0000-0x0000000005BCE000-memory.dmp

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memory/1068-153-0x0000000006160000-0x0000000006192000-memory.dmp

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memory/1068-154-0x000000006F8A0000-0x000000006F8EC000-memory.dmp

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memory/4544-166-0x0000000007230000-0x000000000723A000-memory.dmp

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memory/4636-132-0x00000000745F0000-0x0000000074BA1000-memory.dmp

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memory/4636-136-0x00000000745F0000-0x0000000074BA1000-memory.dmp

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memory/4772-141-0x0000000006880000-0x0000000006892000-memory.dmp

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memory/4772-142-0x0000000006CB0000-0x0000000006CEC000-memory.dmp

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memory/4772-138-0x0000000005C10000-0x00000000061B4000-memory.dmp

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memory/4772-137-0x0000000000D20000-0x0000000000DAC000-memory.dmp

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memory/4772-139-0x0000000005780000-0x0000000005812000-memory.dmp

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memory/4772-140-0x0000000005B60000-0x0000000005BC6000-memory.dmp

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