quasar | bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658

Analysis

max time kernel
149s
max time network
135s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
10/04/2024, 11:16

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General

Target
Client-built.exe
Size 3.1MB
Sample240410-ndmlnsgh21
SHA256 bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
MD5 23aaf5e0d106b0f8ce7b98ebb248fa35
SHA1 898101610b796f5d50de183a04ff029dbc6be064
SHA512 d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40
SSDEEP 49152:DvjI22SsaNYfdPBldt698dBcjH4bRJ6ubR3LoGdRPTHHB72eh2NT:Dvc22SsaNYfdPBldt6+dBcjH4bRJ6oB
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.115:4782

Mutex

cf2c53c5-bc92-40a0-b53b-7c5edbcd7ef3

Attributes

encryption_key
EAFB08E07600E62659A174CCF3C54BA2CDDDD47A
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 payload 3 IoCs

resource	yara_rule
behavioral1/memory/1724-0-0x0000000001190000-0x00000000014B4000-memory.dmp	family_quasar
behavioral1/files/0x000b000000015d0f-4.dat	family_quasar
behavioral1/memory/1056-9-0x0000000000B70000-0x0000000000E94000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1056	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2396	schtasks.exe
2588	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1724	Client-built.exe
Token: SeDebugPrivilege	1056	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1056	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1724 wrote to memory of 2396	1724	Client-built.exe	28
PID 1724 wrote to memory of 2396	1724	Client-built.exe	28
PID 1724 wrote to memory of 2396	1724	Client-built.exe	28
PID 1724 wrote to memory of 1056	1724	Client-built.exe	30
PID 1724 wrote to memory of 1056	1724	Client-built.exe	30
PID 1724 wrote to memory of 1056	1724	Client-built.exe	30
PID 1056 wrote to memory of 2588	1056	Client.exe	31
PID 1056 wrote to memory of 2588	1056	Client.exe	31
PID 1056 wrote to memory of 2588	1056	Client.exe	31

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:1724
- 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⤵
  - Creates scheduled task(s)
  PID:2396
- 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:1056
- - 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⤵
    - Creates scheduled task(s)
    PID:2588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
MD5 23aaf5e0d106b0f8ce7b98ebb248fa35
SHA1 898101610b796f5d50de183a04ff029dbc6be064
SHA512 d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40
SSDEEP 49152:DvjI22SsaNYfdPBldt698dBcjH4bRJ6ubR3LoGdRPTHHB72eh2NT:Dvc22SsaNYfdPBldt6+dBcjH4bRJ6oB
MD5 SHA1 SHA512 SSDEEP

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memory/1056-8-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

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memory/1056-9-0x0000000000B70000-0x0000000000E94000-memory.dmp

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memory/1056-10-0x000000001B100000-0x000000001B180000-memory.dmp

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memory/1056-11-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

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memory/1056-12-0x000000001B100000-0x000000001B180000-memory.dmp

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memory/1724-0-0x0000000001190000-0x00000000014B4000-memory.dmp

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memory/1724-1-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

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memory/1724-2-0x000000001B150000-0x000000001B1D0000-memory.dmp

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memory/1724-7-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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