quasar | 77244092e7dd606f04a3f38af9050f91e6cd78989526e56440a8fa3f5ece758f

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
16-12-2024 06:30

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General

Target

Client-built.exe
Size

3.1MB
MD5

8f5bd87ff24f2310b9c803b764fdae24
SHA1

ac5b97def6b237c077c7cbb26a44b813cd40dfbd
SHA256

77244092e7dd606f04a3f38af9050f91e6cd78989526e56440a8fa3f5ece758f
SHA512

9a216ee4eaef4200ef6264ad5d79a555c2487b8577ff4dce69dd1c37ed00b8ca87f239068c1f36f546faa7b962e9415fc80f8bbe03d1187f87f4fbb1cf9ca22c
SSDEEP

49152:Cvkt62XlaSFNWPjljiFa2RoUYIr4mWmzuLoGdNVaTHHB72eh2NT:Cv462XlaSFNWPjljiFXRoUYIr4msd

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.43.241:4782

Mutex

0d40e7a7-49fe-45a6-9c6d-b8affa11f503

Attributes

encryption_key
6095BF6D5D58D02597F98370DFD1CCEB782F1EDD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svhost
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/2548-1-0x0000000001170000-0x0000000001494000-memory.dmp	family_quasar
behavioral1/files/0x000700000001939b-6.dat	family_quasar
behavioral1/memory/572-9-0x0000000000C90000-0x0000000000FB4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
572	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
2892	schtasks.exe
2760	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2548	Client-built.exe
Token: SeDebugPrivilege	572	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
572	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2548 wrote to memory of 2892	2548	Client-built.exe	29
PID 2548 wrote to memory of 2892	2548	Client-built.exe	29
PID 2548 wrote to memory of 2892	2548	Client-built.exe	29
PID 2548 wrote to memory of 572	2548	Client-built.exe	31
PID 2548 wrote to memory of 572	2548	Client-built.exe	31
PID 2548 wrote to memory of 572	2548	Client-built.exe	31
PID 572 wrote to memory of 2760	572	Client.exe	32
PID 572 wrote to memory of 2760	572	Client.exe	32
PID 572 wrote to memory of 2760	572	Client.exe	32

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:2548
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2892
- 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:572
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "svhost" /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
8f5bd87ff24f2310b9c803b764fdae24

SHA1
ac5b97def6b237c077c7cbb26a44b813cd40dfbd

SHA256
77244092e7dd606f04a3f38af9050f91e6cd78989526e56440a8fa3f5ece758f

SHA512
9a216ee4eaef4200ef6264ad5d79a555c2487b8577ff4dce69dd1c37ed00b8ca87f239068c1f36f546faa7b962e9415fc80f8bbe03d1187f87f4fbb1cf9ca22c

Download Submit
memory/572-8-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/572-9-0x0000000000C90000-0x0000000000FB4000-memory.dmp

Filesize
3.1MB

Download
memory/572-11-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/572-12-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2548-0-0x000007FEF5643000-0x000007FEF5644000-memory.dmp

Filesize
4KB

Download
memory/2548-1-0x0000000001170000-0x0000000001494000-memory.dmp

Filesize
3.1MB

Download
memory/2548-2-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2548-10-0x000007FEF5640000-0x000007FEF602C000-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