quasar | 77244092e7dd606f04a3f38af9050f91e6cd78989526e56440a8fa3f5ece758f

Analysis

max time kernel
126s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-12-2024 06:36

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General

Target

LB2FI_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 2 IoCs

resource	yara_rule
behavioral2/memory/4576-1-0x0000000000B70000-0x0000000000E94000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b82-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1412	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
3024	schtasks.exe
4540	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4576	LB2FI_Client-built.exe
Token: SeDebugPrivilege	1412	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1412	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4576 wrote to memory of 3024	4576	LB2FI_Client-built.exe	83
PID 4576 wrote to memory of 3024	4576	LB2FI_Client-built.exe	83
PID 4576 wrote to memory of 1412	4576	LB2FI_Client-built.exe	85
PID 4576 wrote to memory of 1412	4576	LB2FI_Client-built.exe	85
PID 1412 wrote to memory of 4540	1412	Client.exe	86
PID 1412 wrote to memory of 4540	1412	Client.exe	86

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\LB2FI_Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\LB2FI_Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4576
- 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:3024
- 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:1412
- - 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:4540

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

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
8f5bd87ff24f2310b9c803b764fdae24

SHA1
ac5b97def6b237c077c7cbb26a44b813cd40dfbd

SHA256
77244092e7dd606f04a3f38af9050f91e6cd78989526e56440a8fa3f5ece758f

SHA512
9a216ee4eaef4200ef6264ad5d79a555c2487b8577ff4dce69dd1c37ed00b8ca87f239068c1f36f546faa7b962e9415fc80f8bbe03d1187f87f4fbb1cf9ca22c

Download Submit
memory/1412-10-0x00007FFC27F20000-0x00007FFC289E1000-memory.dmp

Filesize
10.8MB

Download
memory/1412-11-0x00007FFC27F20000-0x00007FFC289E1000-memory.dmp

Filesize
10.8MB

Download
memory/1412-12-0x000000001DF50000-0x000000001DFA0000-memory.dmp

Filesize
320KB

Download
memory/1412-13-0x000000001E060000-0x000000001E112000-memory.dmp

Filesize
712KB

Download
memory/1412-14-0x00007FFC27F20000-0x00007FFC289E1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-0-0x00007FFC27F23000-0x00007FFC27F25000-memory.dmp

Filesize
8KB

Download
memory/4576-1-0x0000000000B70000-0x0000000000E94000-memory.dmp

Filesize
3.1MB

Download
memory/4576-2-0x00007FFC27F20000-0x00007FFC289E1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-9-0x00007FFC27F20000-0x00007FFC289E1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads