quasar | e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

Analysis

max time kernel
148s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
13-12-2024 10:00

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General

Target

Loader.exe
Size

3.1MB
MD5

e9a138d8c5ab2cccc8bf9976f66d30c8
SHA1

e996894168f0d4e852162d1290250dfa986310f8
SHA256

e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3
SHA512

5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc
SSDEEP

49152:fvrI22SsaNYfdPBldt698dBcjHCWvXE/sGkCqILo+dPVTHHB72eh2NT:fvU22SsaNYfdPBldt6+dBcjHCWvTm

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

Dystopian-62863.portmap.host:62863

Mutex

e1de8f9b-5a7a-4798-a6fb-c03591ef3442

Attributes

encryption_key
8C1BB32BFD240218BA0CB04D65341FB1FDE1E001
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SubStart
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/2108-1-0x0000000000240000-0x0000000000564000-memory.dmp	family_quasar
behavioral1/files/0x00080000000173fb-6.dat	family_quasar
behavioral1/memory/2992-10-0x0000000000040000-0x0000000000364000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2992	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
3068	schtasks.exe
2760	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2108	Loader.exe
Token: SeDebugPrivilege	2992	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2992	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2108 wrote to memory of 3068	2108	Loader.exe	30
PID 2108 wrote to memory of 3068	2108	Loader.exe	30
PID 2108 wrote to memory of 3068	2108	Loader.exe	30
PID 2108 wrote to memory of 2992	2108	Loader.exe	32
PID 2108 wrote to memory of 2992	2108	Loader.exe	32
PID 2108 wrote to memory of 2992	2108	Loader.exe	32
PID 2992 wrote to memory of 2760	2992	Client.exe	33
PID 2992 wrote to memory of 2760	2992	Client.exe	33
PID 2992 wrote to memory of 2760	2992	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\Loader.exe
"C:\Users\Admin\AppData\Local\Temp\Loader.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2108
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3068
- 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:2992
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2760

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
e9a138d8c5ab2cccc8bf9976f66d30c8

SHA1
e996894168f0d4e852162d1290250dfa986310f8

SHA256
e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

SHA512
5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

Download Submit
memory/2108-0-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2108-1-0x0000000000240000-0x0000000000564000-memory.dmp

Filesize
3.1MB

Download
memory/2108-2-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2108-8-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-9-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-10-0x0000000000040000-0x0000000000364000-memory.dmp

Filesize
3.1MB

Download
memory/2992-11-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2992-12-0x000007FEF56D0000-0x000007FEF60BC000-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