quasar | 0b196e6b27ed15410bd946b1ccfd1de6b7af64a540cd0226b8eb9bd742d1b095

Analysis

max time kernel
151s
max time network
147s
platform
windows10_x64
resource
win10-en-20211014
submitted
18-10-2021 11:33

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General

Target

1b465c6989637df1d5c511919c43e457.exe
Size

861KB
MD5

1b465c6989637df1d5c511919c43e457
SHA1

317f8bf5133176cd0f4125c6f2f0fdfc226754ab
SHA256

0b196e6b27ed15410bd946b1ccfd1de6b7af64a540cd0226b8eb9bd742d1b095
SHA512

e9dfd465ee22ebf67a73fdd873440d73f013b064e2a4aff3aedad2c5bd1b3027284af7912a383ad6c0a91ef8caad2b3c69cdfd29edb638563d89fd7e89e114dc

Score

10^/10

quasar venomrat office04 evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

grace.adds-only.xyz:1609

Mutex

VNM_MUTEX_c2q7y2ayYutZ2XaYe7

Attributes

encryption_key
wHq4o3k6UfKZv19jkcxs
install_name
winrara.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
SubDir

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/memory/2584-128-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral2/memory/2584-130-0x0000000000486C1E-mapping.dmp	disable_win_def
behavioral2/memory/2584-142-0x0000000004D40000-0x000000000523E000-memory.dmp	disable_win_def
behavioral2/memory/2404-170-0x0000000007630000-0x0000000007B2E000-memory.dmp	disable_win_def
behavioral2/memory/648-652-0x0000000000486C1E-mapping.dmp	disable_win_def
behavioral2/memory/2464-931-0x0000000000486C1E-mapping.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Quasar Payload 6 IoCs

resource	yara_rule
behavioral2/memory/2584-128-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral2/memory/2584-130-0x0000000000486C1E-mapping.dmp	family_quasar
behavioral2/memory/2584-142-0x0000000004D40000-0x000000000523E000-memory.dmp	family_quasar
behavioral2/memory/2404-170-0x0000000007630000-0x0000000007B2E000-memory.dmp	family_quasar
behavioral2/memory/648-652-0x0000000000486C1E-mapping.dmp	family_quasar
behavioral2/memory/2464-931-0x0000000000486C1E-mapping.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware 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 2 IoCs

pid	Process
2404	winrara.exe
648	winrara.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	1b465c6989637df1d5c511919c43e457.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	1b465c6989637df1d5c511919c43e457.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
32	ip-api.com

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2460 set thread context of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2404 set thread context of 648	2404	winrara.exe	87
PID 680 set thread context of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97

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 3 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1568	schtasks.exe
3456	schtasks.exe
908	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
344	PING.EXE

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
2460	1b465c6989637df1d5c511919c43e457.exe
2460	1b465c6989637df1d5c511919c43e457.exe
3540	powershell.exe
3540	powershell.exe
3540	powershell.exe
2520	powershell.exe
2520	powershell.exe
2520	powershell.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2584	1b465c6989637df1d5c511919c43e457.exe
2404	winrara.exe
2404	winrara.exe
2880	powershell.exe
2880	powershell.exe
2880	powershell.exe
680	1b465c6989637df1d5c511919c43e457.exe
680	1b465c6989637df1d5c511919c43e457.exe
364	powershell.exe
364	powershell.exe
364	powershell.exe
2464	1b465c6989637df1d5c511919c43e457.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	2460	1b465c6989637df1d5c511919c43e457.exe
Token: SeDebugPrivilege	3540	powershell.exe
Token: SeDebugPrivilege	2584	1b465c6989637df1d5c511919c43e457.exe
Token: SeDebugPrivilege	2520	powershell.exe
Token: SeDebugPrivilege	2404	winrara.exe
Token: SeDebugPrivilege	2880	powershell.exe
Token: SeDebugPrivilege	648	winrara.exe
Token: SeDebugPrivilege	648	winrara.exe
Token: SeDebugPrivilege	680	1b465c6989637df1d5c511919c43e457.exe
Token: SeDebugPrivilege	364	powershell.exe
Token: SeDebugPrivilege	2464	1b465c6989637df1d5c511919c43e457.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
648	winrara.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 2460 wrote to memory of 3540	2460	1b465c6989637df1d5c511919c43e457.exe	70
PID 2460 wrote to memory of 3540	2460	1b465c6989637df1d5c511919c43e457.exe	70
PID 2460 wrote to memory of 3540	2460	1b465c6989637df1d5c511919c43e457.exe	70
PID 2460 wrote to memory of 1568	2460	1b465c6989637df1d5c511919c43e457.exe	72
PID 2460 wrote to memory of 1568	2460	1b465c6989637df1d5c511919c43e457.exe	72
PID 2460 wrote to memory of 1568	2460	1b465c6989637df1d5c511919c43e457.exe	72
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2460 wrote to memory of 2584	2460	1b465c6989637df1d5c511919c43e457.exe	73
PID 2584 wrote to memory of 2404	2584	1b465c6989637df1d5c511919c43e457.exe	76
PID 2584 wrote to memory of 2404	2584	1b465c6989637df1d5c511919c43e457.exe	76
PID 2584 wrote to memory of 2404	2584	1b465c6989637df1d5c511919c43e457.exe	76
PID 2584 wrote to memory of 2520	2584	1b465c6989637df1d5c511919c43e457.exe	77
PID 2584 wrote to memory of 2520	2584	1b465c6989637df1d5c511919c43e457.exe	77
PID 2584 wrote to memory of 2520	2584	1b465c6989637df1d5c511919c43e457.exe	77
PID 2584 wrote to memory of 296	2584	1b465c6989637df1d5c511919c43e457.exe	81
PID 2584 wrote to memory of 296	2584	1b465c6989637df1d5c511919c43e457.exe	81
PID 2584 wrote to memory of 296	2584	1b465c6989637df1d5c511919c43e457.exe	81
PID 296 wrote to memory of 3136	296	cmd.exe	83
PID 296 wrote to memory of 3136	296	cmd.exe	83
PID 296 wrote to memory of 3136	296	cmd.exe	83
PID 2404 wrote to memory of 2880	2404	winrara.exe	84
PID 2404 wrote to memory of 2880	2404	winrara.exe	84
PID 2404 wrote to memory of 2880	2404	winrara.exe	84
PID 2404 wrote to memory of 3456	2404	winrara.exe	86
PID 2404 wrote to memory of 3456	2404	winrara.exe	86
PID 2404 wrote to memory of 3456	2404	winrara.exe	86
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2404 wrote to memory of 648	2404	winrara.exe	87
PID 2584 wrote to memory of 2176	2584	1b465c6989637df1d5c511919c43e457.exe	89
PID 2584 wrote to memory of 2176	2584	1b465c6989637df1d5c511919c43e457.exe	89
PID 2584 wrote to memory of 2176	2584	1b465c6989637df1d5c511919c43e457.exe	89
PID 2176 wrote to memory of 3896	2176	cmd.exe	91
PID 2176 wrote to memory of 3896	2176	cmd.exe	91
PID 2176 wrote to memory of 3896	2176	cmd.exe	91
PID 2176 wrote to memory of 344	2176	cmd.exe	92
PID 2176 wrote to memory of 344	2176	cmd.exe	92
PID 2176 wrote to memory of 344	2176	cmd.exe	92
PID 2176 wrote to memory of 680	2176	cmd.exe	93
PID 2176 wrote to memory of 680	2176	cmd.exe	93
PID 2176 wrote to memory of 680	2176	cmd.exe	93
PID 680 wrote to memory of 364	680	1b465c6989637df1d5c511919c43e457.exe	94
PID 680 wrote to memory of 364	680	1b465c6989637df1d5c511919c43e457.exe	94
PID 680 wrote to memory of 364	680	1b465c6989637df1d5c511919c43e457.exe	94
PID 680 wrote to memory of 908	680	1b465c6989637df1d5c511919c43e457.exe	96
PID 680 wrote to memory of 908	680	1b465c6989637df1d5c511919c43e457.exe	96
PID 680 wrote to memory of 908	680	1b465c6989637df1d5c511919c43e457.exe	96
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97
PID 680 wrote to memory of 2464	680	1b465c6989637df1d5c511919c43e457.exe	97

C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe
"C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2460
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3540
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kCCzCqEnSxl" /XML "C:\Users\Admin\AppData\Local\Temp\tmp919D.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1568
- C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe
  "C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
  2⤵
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2584
- - C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2404
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2880
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kCCzCqEnSxl" /XML "C:\Users\Admin\AppData\Local\Temp\tmp18AF.tmp"
      4⤵
      Creates scheduled task(s)
      PID:3456
  - - C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\winrara.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:648
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2520
- - 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:296
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:3136
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\HfABvahzud3J.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2176
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:3896
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      Runs ping.exe
      PID:344
  - - C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe
      "C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
      4⤵
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:680
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:364
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kCCzCqEnSxl" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE0C.tmp"
        5⤵
        Creates scheduled task(s)
        
        PID:908
    - - C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe
        
        "C:\Users\Admin\AppData\Local\Temp\1b465c6989637df1d5c511919c43e457.exe"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2464

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/364-973-0x0000000006F43000-0x0000000006F44000-memory.dmp

Filesize
4KB

Download
memory/364-944-0x0000000006F42000-0x0000000006F43000-memory.dmp

Filesize
4KB

Download
memory/364-941-0x0000000006F40000-0x0000000006F41000-memory.dmp

Filesize
4KB

Download
memory/364-972-0x000000007EDC0000-0x000000007EDC1000-memory.dmp

Filesize
4KB

Download
memory/648-664-0x0000000005200000-0x0000000005201000-memory.dmp

Filesize
4KB

Download
memory/680-926-0x0000000007370000-0x000000000786E000-memory.dmp

Filesize
5.0MB

Download
memory/2404-170-0x0000000007630000-0x0000000007B2E000-memory.dmp

Filesize
5.0MB

Download
memory/2460-119-0x0000000004F20000-0x0000000004F21000-memory.dmp

Filesize
4KB

Download
memory/2460-122-0x0000000007860000-0x0000000007868000-memory.dmp

Filesize
32KB

Download
memory/2460-121-0x00000000098C0000-0x00000000098C1000-memory.dmp

Filesize
4KB

Download
memory/2460-120-0x0000000007520000-0x0000000007521000-memory.dmp

Filesize
4KB

Download
memory/2460-123-0x0000000009BC0000-0x0000000009C68000-memory.dmp

Filesize
672KB

Download
memory/2460-118-0x00000000073C0000-0x00000000073C1000-memory.dmp

Filesize
4KB

Download
memory/2460-117-0x00000000078C0000-0x00000000078C1000-memory.dmp

Filesize
4KB

Download
memory/2460-115-0x00000000005D0000-0x00000000005D1000-memory.dmp

Filesize
4KB

Download
memory/2464-942-0x0000000005540000-0x0000000005541000-memory.dmp

Filesize
4KB

Download
memory/2520-171-0x00000000011A0000-0x00000000011A1000-memory.dmp

Filesize
4KB

Download
memory/2520-261-0x000000007F840000-0x000000007F841000-memory.dmp

Filesize
4KB

Download
memory/2520-172-0x00000000011A2000-0x00000000011A3000-memory.dmp

Filesize
4KB

Download
memory/2520-156-0x00000000002D0000-0x00000000002D1000-memory.dmp

Filesize
4KB

Download
memory/2520-158-0x00000000002D0000-0x00000000002D1000-memory.dmp

Filesize
4KB

Download
memory/2520-263-0x00000000011A3000-0x00000000011A4000-memory.dmp

Filesize
4KB

Download
memory/2584-142-0x0000000004D40000-0x000000000523E000-memory.dmp

Filesize
5.0MB

Download
memory/2584-128-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2584-148-0x0000000006050000-0x0000000006051000-memory.dmp

Filesize
4KB

Download
memory/2584-147-0x0000000005B40000-0x0000000005B41000-memory.dmp

Filesize
4KB

Download
memory/2880-737-0x00000000071A3000-0x00000000071A4000-memory.dmp

Filesize
4KB

Download
memory/2880-689-0x000000007EB30000-0x000000007EB31000-memory.dmp

Filesize
4KB

Download
memory/2880-662-0x00000000071A0000-0x00000000071A1000-memory.dmp

Filesize
4KB

Download
memory/2880-663-0x00000000071A2000-0x00000000071A3000-memory.dmp

Filesize
4KB

Download
memory/3540-146-0x0000000008500000-0x0000000008501000-memory.dmp

Filesize
4KB

Download
memory/3540-139-0x0000000007E80000-0x0000000007E81000-memory.dmp

Filesize
4KB

Download
memory/3540-162-0x00000000010A0000-0x00000000010A1000-memory.dmp

Filesize
4KB

Download
memory/3540-213-0x0000000004B43000-0x0000000004B44000-memory.dmp

Filesize
4KB

Download
memory/3540-143-0x0000000007C90000-0x0000000007C91000-memory.dmp

Filesize
4KB

Download
memory/3540-191-0x000000007EF50000-0x000000007EF51000-memory.dmp

Filesize
4KB

Download
memory/3540-141-0x0000000004B42000-0x0000000004B43000-memory.dmp

Filesize
4KB

Download
memory/3540-140-0x0000000004B40000-0x0000000004B41000-memory.dmp

Filesize
4KB

Download
memory/3540-144-0x0000000008750000-0x0000000008751000-memory.dmp

Filesize
4KB

Download
memory/3540-137-0x0000000007580000-0x0000000007581000-memory.dmp

Filesize
4KB

Download
memory/3540-138-0x0000000007E10000-0x0000000007E11000-memory.dmp

Filesize
4KB

Download
memory/3540-136-0x00000000073D0000-0x00000000073D1000-memory.dmp

Filesize
4KB

Download
memory/3540-131-0x0000000007600000-0x0000000007601000-memory.dmp

Filesize
4KB

Download
memory/3540-188-0x0000000009300000-0x0000000009301000-memory.dmp

Filesize
4KB

Download
memory/3540-181-0x0000000009320000-0x0000000009353000-memory.dmp

Filesize
204KB

Download
memory/3540-129-0x0000000001250000-0x0000000001251000-memory.dmp

Filesize
4KB

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memory/3540-125-0x00000000010A0000-0x00000000010A1000-memory.dmp

Filesize
4KB

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memory/3540-127-0x00000000010A0000-0x00000000010A1000-memory.dmp

Filesize
4KB

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