quasar | 782cb75964f805a2a2262b562b65578bfe1effe29216d1d378fc4ef58995b05f

Analysis

max time kernel
19s
max time network
20s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
09-11-2024 00:35

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General

Target

fdgdrg.exe
Size

3.1MB
MD5

6dca905cc20dbcab16e4ea7a46fccd15
SHA1

c896ae49f3d6c18647c94b20769e9c94c13ef86c
SHA256

782cb75964f805a2a2262b562b65578bfe1effe29216d1d378fc4ef58995b05f
SHA512

3aa510ce8c2facd929685f3beecad8ea60fad3996533333a478bc776797c1061ae199f3520760abc105a3f7f236cf255c4be5efa1559a3a103c358092bcdbde0
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH3IRJ6cbR3LoGdJfvTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjH3IRJ6m

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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
behavioral1/memory/4528-1-0x00000000005E0000-0x0000000000904000-memory.dmp	family_quasar
behavioral1/files/0x00290000000451a8-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3036	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
1936	schtasks.exe
400	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	fdgdrg.exe
Token: SeDebugPrivilege	3036	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3036	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 1936	4528	fdgdrg.exe	85
PID 4528 wrote to memory of 1936	4528	fdgdrg.exe	85
PID 4528 wrote to memory of 3036	4528	fdgdrg.exe	87
PID 4528 wrote to memory of 3036	4528	fdgdrg.exe	87
PID 3036 wrote to memory of 400	3036	Client.exe	88
PID 3036 wrote to memory of 400	3036	Client.exe	88

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\fdgdrg.exe
"C:\Users\Admin\AppData\Local\Temp\fdgdrg.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4528
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1936
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:400

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:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
6dca905cc20dbcab16e4ea7a46fccd15

SHA1
c896ae49f3d6c18647c94b20769e9c94c13ef86c

SHA256
782cb75964f805a2a2262b562b65578bfe1effe29216d1d378fc4ef58995b05f

SHA512
3aa510ce8c2facd929685f3beecad8ea60fad3996533333a478bc776797c1061ae199f3520760abc105a3f7f236cf255c4be5efa1559a3a103c358092bcdbde0

Download Submit
memory/3036-6-0x00007FFEE8170000-0x00007FFEE8C32000-memory.dmp

Filesize
10.8MB

Download
memory/3036-7-0x00007FFEE8170000-0x00007FFEE8C32000-memory.dmp

Filesize
10.8MB

Download
memory/3036-8-0x000000001C7A0000-0x000000001C7F0000-memory.dmp

Filesize
320KB

Download
memory/3036-9-0x000000001C8B0000-0x000000001C962000-memory.dmp

Filesize
712KB

Download
memory/3036-10-0x00007FFEE8170000-0x00007FFEE8C32000-memory.dmp

Filesize
10.8MB

Download
memory/4528-0-0x00007FFEE8173000-0x00007FFEE8175000-memory.dmp

Filesize
8KB

Download
memory/4528-1-0x00000000005E0000-0x0000000000904000-memory.dmp

Filesize
3.1MB

Download
memory/4528-2-0x00007FFEE8170000-0x00007FFEE8C32000-memory.dmp

Filesize
10.8MB

Download
memory/4528-5-0x00007FFEE8170000-0x00007FFEE8C32000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads