quasar | 457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

Analysis

max time kernel
133s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-12-2024 02:15

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General

Target

457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe
Size

3.1MB
MD5

87b488fc8f9760bc9182c32ef76be93c
SHA1

16c3c1c53963cfedb800515b70e27ca2b7dd79fd
SHA256

457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978
SHA512

30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c
SSDEEP

49152:evQI22SsaNYfdPBldt698dBcjHaLA3qarWboGdmhIOTHHB72eh2NT:evt22SsaNYfdPBldt6+dBcjHN3c

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

43.138.147.74:4782

Mutex

4b095ece-017a-46f8-874b-d1266394fa10

Attributes

encryption_key
AB08BB6743A540F991F118F0E7BF74E3D06D95A1
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 2 IoCs

resource	yara_rule
behavioral2/memory/1596-1-0x00000000004A0000-0x00000000007C4000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b8f-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2148	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe

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
2188	schtasks.exe
4572	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1596	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe
Token: SeDebugPrivilege	2148	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2148	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 2188	1596	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe	83
PID 1596 wrote to memory of 2188	1596	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe	83
PID 1596 wrote to memory of 2148	1596	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe	85
PID 1596 wrote to memory of 2148	1596	457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe	85
PID 2148 wrote to memory of 4572	2148	Client.exe	86
PID 2148 wrote to memory of 4572	2148	Client.exe	86

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\457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe
"C:\Users\Admin\AppData\Local\Temp\457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1596
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2188
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2148
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4572

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
87b488fc8f9760bc9182c32ef76be93c

SHA1
16c3c1c53963cfedb800515b70e27ca2b7dd79fd

SHA256
457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

SHA512
30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c

Download Submit
memory/1596-0-0x00007FFD41BF3000-0x00007FFD41BF5000-memory.dmp

Filesize
8KB

Download
memory/1596-1-0x00000000004A0000-0x00000000007C4000-memory.dmp

Filesize
3.1MB

Download
memory/1596-2-0x00007FFD41BF0000-0x00007FFD426B1000-memory.dmp

Filesize
10.8MB

Download
memory/1596-8-0x00007FFD41BF0000-0x00007FFD426B1000-memory.dmp

Filesize
10.8MB

Download
memory/2148-9-0x00007FFD41BF0000-0x00007FFD426B1000-memory.dmp

Filesize
10.8MB

Download
memory/2148-10-0x00007FFD41BF0000-0x00007FFD426B1000-memory.dmp

Filesize
10.8MB

Download
memory/2148-11-0x000000001B850000-0x000000001B8A0000-memory.dmp

Filesize
320KB

Download
memory/2148-12-0x000000001B960000-0x000000001BA12000-memory.dmp

Filesize
712KB

Download
memory/2148-13-0x00007FFD41BF0000-0x00007FFD426B1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads