quasar | f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
04-01-2025 10:04

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General

Target

Client-built.exe
Size

3.1MB
MD5

00213fcafbc3094166240f85a2113a48
SHA1

bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be
SHA256

f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6
SHA512

b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10
SSDEEP

49152:rvmI22SsaNYfdPBldt698dBcjHGCW1JbLoGd4THHB72eh2NT:rvr22SsaNYfdPBldt6+dBcjHGCi

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.46:4782

Mutex

f6997eed-21d3-4b8e-b10b-56ea04111c63

Attributes

encryption_key
7E7C408B51CEDDF4082BCC64D506AE67B3B3044D
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
behavioral1/memory/2004-1-0x0000000000C70000-0x0000000000F94000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d06-6.dat	family_quasar
behavioral1/memory/2332-10-0x0000000000F10000-0x0000000001234000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2332	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
3036	schtasks.exe
2884	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2004	Client-built.exe
Token: SeDebugPrivilege	2332	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2004 wrote to memory of 3036	2004	Client-built.exe	30
PID 2004 wrote to memory of 3036	2004	Client-built.exe	30
PID 2004 wrote to memory of 3036	2004	Client-built.exe	30
PID 2004 wrote to memory of 2332	2004	Client-built.exe	32
PID 2004 wrote to memory of 2332	2004	Client-built.exe	32
PID 2004 wrote to memory of 2332	2004	Client-built.exe	32
PID 2332 wrote to memory of 2884	2332	Client.exe	33
PID 2332 wrote to memory of 2884	2332	Client.exe	33
PID 2332 wrote to memory of 2884	2332	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2004
- 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:3036
- 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 WriteProcessMemory
  PID:2332
- - 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:2884

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
00213fcafbc3094166240f85a2113a48

SHA1
bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be

SHA256
f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

SHA512
b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10

Download Submit
memory/2004-0-0x000007FEF5463000-0x000007FEF5464000-memory.dmp

Filesize
4KB

Download
memory/2004-1-0x0000000000C70000-0x0000000000F94000-memory.dmp

Filesize
3.1MB

Download
memory/2004-2-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

Filesize
9.9MB

Download
memory/2004-9-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-8-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-10-0x0000000000F10000-0x0000000001234000-memory.dmp

Filesize
3.1MB

Download
memory/2332-11-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-12-0x000007FEF5460000-0x000007FEF5E4C000-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