quasar | ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695

Analysis

max time kernel
126s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
15-01-2025 20:51

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General

Target

Client-built.exe
Size

3.1MB
MD5

9e50097d21a19941ba554a3ee1f808c7
SHA1

af332959d09f257bfb6dc0fe6783e359da2bf4cc
SHA256

ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695
SHA512

61365d695b888d468400f34afc91bef1ddf199e94214eafceef4bdda6e263d07ec07831370d2f4445e1c2a39d2fdc6efd951645dbb0eb7a56f93feb0c16b41a6
SSDEEP

49152:Kvot62XlaSFNWPjljiFa2RoUYI15IcEiOKk/tLoGdboTHHB72eh2NT:Kvk62XlaSFNWPjljiFXRoUYIvIL

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.5:139

Mutex

4a047de5-e1ae-4dca-af7e-8a42a9c851fd

Attributes

encryption_key
5B8D480293BBEEB0E867D6BE63ACD141EC9C469F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/4512-1-0x00000000008E0000-0x0000000000C04000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023cc5-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3148	Client.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.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
2588	schtasks.exe
1984	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4512	Client-built.exe
Token: SeDebugPrivilege	3148	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3148	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4512 wrote to memory of 2588	4512	Client-built.exe	82
PID 4512 wrote to memory of 2588	4512	Client-built.exe	82
PID 4512 wrote to memory of 3148	4512	Client-built.exe	84
PID 4512 wrote to memory of 3148	4512	Client-built.exe	84
PID 3148 wrote to memory of 1984	3148	Client.exe	85
PID 3148 wrote to memory of 1984	3148	Client.exe	85

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4512
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2588
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3148
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1984

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
9e50097d21a19941ba554a3ee1f808c7

SHA1
af332959d09f257bfb6dc0fe6783e359da2bf4cc

SHA256
ad1f0223d956f363ef09ac2112ed249c0057f81ff96ab9bf3d89eef466ba7695

SHA512
61365d695b888d468400f34afc91bef1ddf199e94214eafceef4bdda6e263d07ec07831370d2f4445e1c2a39d2fdc6efd951645dbb0eb7a56f93feb0c16b41a6

Download Submit
memory/3148-9-0x00007FFC37520000-0x00007FFC37FE1000-memory.dmp

Filesize
10.8MB

Download
memory/3148-11-0x00007FFC37520000-0x00007FFC37FE1000-memory.dmp

Filesize
10.8MB

Download
memory/3148-12-0x000000001DEC0000-0x000000001DF10000-memory.dmp

Filesize
320KB

Download
memory/3148-13-0x000000001DFD0000-0x000000001E082000-memory.dmp

Filesize
712KB

Download
memory/3148-14-0x00007FFC37520000-0x00007FFC37FE1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-0-0x00007FFC37523000-0x00007FFC37525000-memory.dmp

Filesize
8KB

Download
memory/4512-1-0x00000000008E0000-0x0000000000C04000-memory.dmp

Filesize
3.1MB

Download
memory/4512-2-0x00007FFC37520000-0x00007FFC37FE1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-10-0x00007FFC37520000-0x00007FFC37FE1000-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