quasar | 48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01

Analysis

max time kernel
120s
max time network
125s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
03-11-2024 19:55

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General

Target

Client-built.exe
Size

3.1MB
MD5

f5b93af3ee1b64dacd2bac9ba4af9b27
SHA1

1f2a038199a71a2b917dca4dff2f5fac5e840978
SHA256

48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01
SHA512

83703b0f567723abe3d6b34bd419be5df3475e049ae8893993fec017da9a420cd875184c570bdffbfc0bccac662762991885dea8ebcc2af172b3aac2fb00a302
SSDEEP

49152:mv2I22SsaNYfdPBldt698dBcjHQzRJ6TbR3LoGd/oobTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHQzRJ6FA

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

Inversin-43597.portmap.host:43597

Mutex

80329fd2-f063-4b06-9c7e-8dbc6278c2a3

Attributes

encryption_key
744EA1A385FEBC6DA96387411B7000D77E66B075
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2892-1-0x0000000000DC0000-0x00000000010E4000-memory.dmp	family_quasar

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exe

pid	Process
2224	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Client-built.exe

description	pid	Process
Token: SeDebugPrivilege	2892	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

Client-built.exe

description	pid	Process	procid_target
PID 2892 wrote to memory of 2224	2892	Client-built.exe	30
PID 2892 wrote to memory of 2224	2892	Client-built.exe	30
PID 2892 wrote to memory of 2224	2892	Client-built.exe	30

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:2892
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2224

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

Replay Monitor

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Downloads

memory/2892-0-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2892-1-0x0000000000DC0000-0x00000000010E4000-memory.dmp

Filesize
3.1MB

Download
memory/2892-2-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2892-4-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2892-5-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download