quasar | 8904d96a473dd52cd5255e046d47148eb27cc778395fff4f220bbb9509f643d8

Analysis

max time kernel
588s
max time network
598s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
28/04/2024, 00:05

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General

Target
IDTOIPBYR_0.exe
Size 38KB
Sample240428-ac5tzabe55
SHA256 c924d7502dcf3af74739270218066f0431678e122fa35aefefdacc1edd2b1b0c
MD5 b653b660e1aca5529c24b1ee268b2829
SHA1 a05cbb401ab1648e1078f1a27286c5f7155d357f
SHA512 9cee437b7524deabc31d9a219e77ef72cbc342563e6c34a0f2aa568b8b35a91cfe81c91fcd6ba085238664f374d200d6017e3e6fd8c5e0d0f751b802fc043e2f
SSDEEP 384:nLRF4OFc5Kjagmz2OpZkWX+lnjofGZTW65TRE0iA97aa9yN+JWhDCEjUoe0BFqCd:nLRFDTXOGZv5O0iW2awrUoDBFq3D0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Office04

147.185.221.19:33587

Mutex

$Sxr-lG7PreqFKmNhJc0CKS

Attributes

encryption_key
11fnZjAdVB1EIQVhl7wn
install_name
DLLrunhost.exe
log_directory
UpdLogs
reconnect_delay
3000
startup_key
WindowsAudioHelper
subdirectory
Windows

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral7/memory/1800-0-0x0000000000C20000-0x0000000000C8E000-memory.dmp	family_quasar
behavioral7/files/0x0012000000015ca9-6.dat	family_quasar
behavioral7/memory/2784-12-0x0000000000C70000-0x0000000000CDE000-memory.dmp	family_quasar

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	IDTOIPBYR_0.exe

Executes dropped EXE 1 IoCs

pid	Process
2784	DLLrunhost.exe

Loads dropped DLL 1 IoCs

pid	Process
1800	IDTOIPBYR_0.exe

Looks up external IP address via web service 4 IoCs

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

flow	ioc
2	ip-api.com
6	api.ipify.org
7	ip-api.com
9	api.ipify.org

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 3 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2636	schtasks.exe
2420	SCHTASKS.exe
2828	schtasks.exe

Gathers network information 2 TTPs 1 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command and Scripting Interpreter

T1059

pid	Process
2740	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2836	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1800	IDTOIPBYR_0.exe
Token: SeDebugPrivilege	2836	powershell.exe
Token: SeDebugPrivilege	2784	DLLrunhost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2784	DLLrunhost.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	29
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	29
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	29
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	29
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	31
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	32
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	32
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	32
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	32
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	34
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	34
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	34
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	34
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	36
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	36
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	36
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	36
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	40
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	40
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	40
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	40

C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe
"C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe"
1⤵
- Drops file in Drivers directory
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1800
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "WindowsAudioHelper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2636
- C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe
  "C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2784
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "WindowsAudioHelper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2828
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath (Get-Item -LiteralPath $env:SystemRoot).Root"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2836
- C:\Windows\SysWOW64\ipconfig.exe
  "C:\Windows\System32\ipconfig.exe" /flushdns
  2⤵
  - Gathers network information
  PID:2740
- C:\Windows\SysWOW64\SCHTASKS.exe
  "SCHTASKS.exe" /create /tn "$77IDTOIPBYR_0.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe'" /sc onlogon /rl HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:2420

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

DLLrunhost.exe

Path \Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe
Size 413KB
SHA256 4466cd4392c0fa3c49979664630db1b607e129c858fd44507cf5fc6b5b9dd3ba
MD5 aabcedbac7ad8b10993f6de878be1ba4
SHA1 be8ea58edc1e83ebf33fe0e87a29916e9c554426
SHA512 5a2bb094997699335a149ca353dc5e98e66482aa9dadc52502068337760bbd65bd648b3935777f4424e9811705657bcd2eb38254d731d892256d578c1f1eaf66
SSDEEP 6144:2gmEjkzQT1TVNSeE7E11zVeusnib8YoVHR8z0n7kgpMRqZGe:T1TVVXEo13eusHnVH9pMRWGe
MD5 SHA1 SHA512 SSDEEP

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memory/1800-0-0x0000000000C20000-0x0000000000C8E000-memory.dmp

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memory/1800-1-0x0000000074590000-0x0000000074C7E000-memory.dmp

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memory/1800-2-0x0000000004B80000-0x0000000004BC0000-memory.dmp

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memory/1800-3-0x0000000074590000-0x0000000074C7E000-memory.dmp

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memory/1800-4-0x0000000004B80000-0x0000000004BC0000-memory.dmp

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memory/1800-16-0x0000000074590000-0x0000000074C7E000-memory.dmp

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memory/2784-13-0x0000000074590000-0x0000000074C7E000-memory.dmp

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memory/2784-12-0x0000000000C70000-0x0000000000CDE000-memory.dmp

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memory/2784-17-0x0000000074590000-0x0000000074C7E000-memory.dmp

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