quasar | 2bcc519da18324c5cfde4f0e7a2e6fa3d7e8b2c3c020ced81f07460f77476ed3

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-11-2024 21:56

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General

Target

Build-Client.exe
Size

3.1MB
MD5

c34d921ff3487c05cfff4991df196535
SHA1

c9c7ae70b2020a3f80996a1399b6eb160cfbf72c
SHA256

2bcc519da18324c5cfde4f0e7a2e6fa3d7e8b2c3c020ced81f07460f77476ed3
SHA512

35f51730586e8107a87aadf9bb902282285aabb2ef9ebd0e119d76e56a80f7608eb6bc799392a7c99cfd1e83e9d9626780b9b0bbc170888a4de43fd1cb360f88
SSDEEP

49152:SvzlL26AaNeWgPhlmVqvMQ7XSK9gRJ6/bR3LoGd3kTHHB72eh2NT:SvpL26AaNeWgPhlmVqkQ7XSK9gRJ6R

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.113:4782

Mutex

c82ea6b0-d255-45fb-b0eb-547ab14c0e9e

Attributes

encryption_key
045BFCAC42C40445C0D8EBEF569DD1BF4BB62A56
install_name
Build-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 family
quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3088-1-0x0000000000430000-0x0000000000754000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023ca2-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Build-client.exe

pid	Process
1152	Build-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

Processes:

schtasks.exeschtasks.exe

pid	Process
1136	schtasks.exe
2216	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Build-Client.exeBuild-client.exe

description	pid	Process
Token: SeDebugPrivilege	3088	Build-Client.exe
Token: SeDebugPrivilege	1152	Build-client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Build-client.exe

pid	Process
1152	Build-client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Build-Client.exeBuild-client.exe

description	pid	Process	procid_target
PID 3088 wrote to memory of 1136	3088	Build-Client.exe	82
PID 3088 wrote to memory of 1136	3088	Build-Client.exe	82
PID 3088 wrote to memory of 1152	3088	Build-Client.exe	84
PID 3088 wrote to memory of 1152	3088	Build-Client.exe	84
PID 1152 wrote to memory of 2216	1152	Build-client.exe	85
PID 1152 wrote to memory of 2216	1152	Build-client.exe	85

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\Build-Client.exe
"C:\Users\Admin\AppData\Local\Temp\Build-Client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3088
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1136
- C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1152
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2216

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\Local\Microsoft\CLR_v4.0\UsageLogs\Build-client.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Build-client.exe

Filesize
3.1MB

MD5
c34d921ff3487c05cfff4991df196535

SHA1
c9c7ae70b2020a3f80996a1399b6eb160cfbf72c

SHA256
2bcc519da18324c5cfde4f0e7a2e6fa3d7e8b2c3c020ced81f07460f77476ed3

SHA512
35f51730586e8107a87aadf9bb902282285aabb2ef9ebd0e119d76e56a80f7608eb6bc799392a7c99cfd1e83e9d9626780b9b0bbc170888a4de43fd1cb360f88

Download Submit
memory/1152-11-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

Filesize
10.8MB

Download
memory/1152-12-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

Filesize
10.8MB

Download
memory/1152-13-0x000000001C040000-0x000000001C090000-memory.dmp

Filesize
320KB

Download
memory/1152-14-0x000000001C770000-0x000000001C822000-memory.dmp

Filesize
712KB

Download
memory/1152-15-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

Filesize
10.8MB

Download
memory/3088-0-0x00007FFF96F53000-0x00007FFF96F55000-memory.dmp

Filesize
8KB

Download
memory/3088-1-0x0000000000430000-0x0000000000754000-memory.dmp

Filesize
3.1MB

Download
memory/3088-2-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

Filesize
10.8MB

Download
memory/3088-10-0x00007FFF96F50000-0x00007FFF97A11000-memory.dmp

Filesize
10.8MB

Download