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
MD5

b653b660e1aca5529c24b1ee268b2829
SHA1

a05cbb401ab1648e1078f1a27286c5f7155d357f
SHA256

c924d7502dcf3af74739270218066f0431678e122fa35aefefdacc1edd2b1b0c
SHA512

9cee437b7524deabc31d9a219e77ef72cbc342563e6c34a0f2aa568b8b35a91cfe81c91fcd6ba085238664f374d200d6017e3e6fd8c5e0d0f751b802fc043e2f
SSDEEP

384:nLRF4OFc5Kjagmz2OpZkWX+lnjofGZTW65TRE0iA97aa9yN+JWhDCEjUoe0BFqCd:nLRFDTXOGZv5O0iW2awrUoDBFq3D0

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

Processes:

resource	yara_rule
behavioral7/memory/1800-0-0x0000000000C20000-0x0000000000C8E000-memory.dmp	family_quasar
\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe	family_quasar
behavioral7/memory/2784-12-0x0000000000C70000-0x0000000000CDE000-memory.dmp	family_quasar

Drops file in Drivers directory 1 IoCs

Processes:

IDTOIPBYR_0.exe

description ioc process

File opened for modification C:\Windows\system32\drivers\etc\hosts IDTOIPBYR_0.exe
Executes dropped EXE 1 IoCs

Processes:

DLLrunhost.exe

pid process

2784 DLLrunhost.exe
Loads dropped DLL 1 IoCs

Processes:

IDTOIPBYR_0.exe

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.

Processes:

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

Processes:

schtasks.exeSCHTASKS.exeschtasks.exe

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

Processes:

ipconfig.exe

pid process

2740 ipconfig.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid process

2836 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

IDTOIPBYR_0.exepowershell.exeDLLrunhost.exe

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

Processes:

DLLrunhost.exe

pid process

2784 DLLrunhost.exe

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

pid	process
2784	DLLrunhost.exe

pid	process
1800	IDTOIPBYR_0.exe

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

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

pid	process
2740	ipconfig.exe

pid	process
2836	powershell.exe

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

pid	process
2784	DLLrunhost.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

IDTOIPBYR_0.exeDLLrunhost.exe

description	pid	process	target process
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	schtasks.exe
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	schtasks.exe
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	schtasks.exe
PID 1800 wrote to memory of 2636	1800	IDTOIPBYR_0.exe	schtasks.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2784	1800	IDTOIPBYR_0.exe	DLLrunhost.exe
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	powershell.exe
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	powershell.exe
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	powershell.exe
PID 1800 wrote to memory of 2836	1800	IDTOIPBYR_0.exe	powershell.exe
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	ipconfig.exe
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	ipconfig.exe
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	ipconfig.exe
PID 1800 wrote to memory of 2740	1800	IDTOIPBYR_0.exe	ipconfig.exe
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	SCHTASKS.exe
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	SCHTASKS.exe
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	SCHTASKS.exe
PID 1800 wrote to memory of 2420	1800	IDTOIPBYR_0.exe	SCHTASKS.exe
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	schtasks.exe
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	schtasks.exe
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	schtasks.exe
PID 2784 wrote to memory of 2828	2784	DLLrunhost.exe	schtasks.exe

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 Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Command and Scripting Interpreter

T1059

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe
Filesize
413KB

MD5
aabcedbac7ad8b10993f6de878be1ba4

SHA1
be8ea58edc1e83ebf33fe0e87a29916e9c554426

SHA256
4466cd4392c0fa3c49979664630db1b607e129c858fd44507cf5fc6b5b9dd3ba

SHA512
5a2bb094997699335a149ca353dc5e98e66482aa9dadc52502068337760bbd65bd648b3935777f4424e9811705657bcd2eb38254d731d892256d578c1f1eaf66

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

Filesize
440KB

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

Filesize
6.9MB

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

Filesize
256KB

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

Filesize
6.9MB

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

Filesize
256KB

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

Filesize
6.9MB

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

Filesize
6.9MB

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

Filesize
440KB

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

Filesize
6.9MB

Download