quasar | 5e5d5458b8a025c2bc9a6e7998492989732967c9a1019b11d655200adf3686c7

Analysis

max time kernel
148s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 06:13

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General

Target

8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe
Size

3.1MB
MD5

7ba765750b28b352b1770f1f0972b0b4
SHA1

1c8a508c4d15570564c0a0aeb30f1a025dd6d979
SHA256

8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff
SHA512

560529ad098bb0e53c752eeb8821dd1c74edd68b1ae684da75435376dd330ad2f75b1c9497e71947737131e341f66e08ba7ee1a5a1e99e1137313a0e1af2feef
SSDEEP

49152:2vtt62XlaSFNWPjljiFa2RoUYIp9X4ECsOk/G8BoGdoEFTHHB72eh2NT:2vP62XlaSFNWPjljiFXRoUYIp9XeGt

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

127.0.0.1:4782

Mutex

84175f70-6895-4140-be06-b5c46fc6df10

Attributes

encryption_key
6BD7AEB86CDFCFD871F4180FF15AF1BB30573FC6
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral7/memory/2820-1-0x0000000000CE0000-0x0000000001004000-memory.dmp	family_quasar
behavioral7/files/0x003500000001543d-6.dat	family_quasar
behavioral7/memory/2124-7-0x00000000010D0000-0x00000000013F4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2124	Client.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2640	schtasks.exe
3060	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe
Token: SeDebugPrivilege	2124	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2124	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2124	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 3060	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	30
PID 2820 wrote to memory of 3060	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	30
PID 2820 wrote to memory of 3060	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	30
PID 2820 wrote to memory of 2124	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	32
PID 2820 wrote to memory of 2124	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	32
PID 2820 wrote to memory of 2124	2820	8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe	32
PID 2124 wrote to memory of 2640	2124	Client.exe	33
PID 2124 wrote to memory of 2640	2124	Client.exe	33
PID 2124 wrote to memory of 2640	2124	Client.exe	33

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe
"C:\Users\Admin\AppData\Local\Temp\8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2820
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3060
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2124
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2640

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
7ba765750b28b352b1770f1f0972b0b4

SHA1
1c8a508c4d15570564c0a0aeb30f1a025dd6d979

SHA256
8242f8a80325df8bb3e826fd03cf2d8ba7595d26428d7594f15b2cec819013ff

SHA512
560529ad098bb0e53c752eeb8821dd1c74edd68b1ae684da75435376dd330ad2f75b1c9497e71947737131e341f66e08ba7ee1a5a1e99e1137313a0e1af2feef

Download Submit
memory/2124-7-0x00000000010D0000-0x00000000013F4000-memory.dmp

Filesize
3.1MB

Download
memory/2124-8-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2124-9-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2124-11-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2820-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2820-1-0x0000000000CE0000-0x0000000001004000-memory.dmp

Filesize
3.1MB

Download
memory/2820-2-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2820-10-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads