quasar | 1b586bfe3423ef03ecba497e90fd31b42022dd8e1f325e212c1e23cc58ba7be7

Analysis

max time kernel
150s
max time network
135s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
25-06-2024 08:46

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General

Target

AA5DA5D211DD6B3C5E9404520EBEEC1F.exe
Size

3.1MB
MD5

aa5da5d211dd6b3c5e9404520ebeec1f
SHA1

037e6d5fa8398a3f95df469d60debe6fc8c93f89
SHA256

1b586bfe3423ef03ecba497e90fd31b42022dd8e1f325e212c1e23cc58ba7be7
SHA512

9a02a50c2534ece296d183bd712f8be240f4e5d989842656e28392af41036d29dc30cf205fe3526b980a480c54c3d9a4de7f5ef35103dec2d29fb513d2e83b72
SSDEEP

49152:PvSI22SsaNYfdPBldt698dBcjHod/oKT2fOTmZPKoGANtTHHB72eh2NT:Pv/22SsaNYfdPBldt6+dBcjHE/oKDg

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

91.92.242.80:4782

Mutex

e88cd5c3-d3f7-4cbb-94a7-7136e3bc6ab9

Attributes

encryption_key
B1F363CB165B4ADD4702FD386A0A1054BFED678C
install_name
WindowsUpdate.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows.Update
subdirectory
Update

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1924-1-0x0000000000B10000-0x0000000000E34000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe	family_quasar
behavioral1/memory/2668-9-0x0000000000BB0000-0x0000000000ED4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

WindowsUpdate.exe

pid process

2668 WindowsUpdate.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

2996 schtasks.exe
2576 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AA5DA5D211DD6B3C5E9404520EBEEC1F.exeWindowsUpdate.exe

description pid process

Token: SeDebugPrivilege 1924 AA5DA5D211DD6B3C5E9404520EBEEC1F.exe
Token: SeDebugPrivilege 2668 WindowsUpdate.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

WindowsUpdate.exe

pid process

2668 WindowsUpdate.exe

pid	process
2668	WindowsUpdate.exe

pid	process
2996	schtasks.exe
2576	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe
Token: SeDebugPrivilege	2668	WindowsUpdate.exe

pid	process
2668	WindowsUpdate.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

AA5DA5D211DD6B3C5E9404520EBEEC1F.exeWindowsUpdate.exe

description	pid	process	target process
PID 1924 wrote to memory of 2996	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	schtasks.exe
PID 1924 wrote to memory of 2996	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	schtasks.exe
PID 1924 wrote to memory of 2996	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	schtasks.exe
PID 1924 wrote to memory of 2668	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	WindowsUpdate.exe
PID 1924 wrote to memory of 2668	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	WindowsUpdate.exe
PID 1924 wrote to memory of 2668	1924	AA5DA5D211DD6B3C5E9404520EBEEC1F.exe	WindowsUpdate.exe
PID 2668 wrote to memory of 2576	2668	WindowsUpdate.exe	schtasks.exe
PID 2668 wrote to memory of 2576	2668	WindowsUpdate.exe	schtasks.exe
PID 2668 wrote to memory of 2576	2668	WindowsUpdate.exe	schtasks.exe

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\AA5DA5D211DD6B3C5E9404520EBEEC1F.exe
"C:\Users\Admin\AppData\Local\Temp\AA5DA5D211DD6B3C5E9404520EBEEC1F.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1924

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows.Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:2996

C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe
"C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2668

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows.Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2576

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Update\WindowsUpdate.exe
Filesize
3.1MB

MD5
aa5da5d211dd6b3c5e9404520ebeec1f

SHA1
037e6d5fa8398a3f95df469d60debe6fc8c93f89

SHA256
1b586bfe3423ef03ecba497e90fd31b42022dd8e1f325e212c1e23cc58ba7be7

SHA512
9a02a50c2534ece296d183bd712f8be240f4e5d989842656e28392af41036d29dc30cf205fe3526b980a480c54c3d9a4de7f5ef35103dec2d29fb513d2e83b72

Download Submit
memory/1924-0-0x000007FEF5C73000-0x000007FEF5C74000-memory.dmp

Filesize
4KB

Download
memory/1924-1-0x0000000000B10000-0x0000000000E34000-memory.dmp

Filesize
3.1MB

Download
memory/1924-2-0x000007FEF5C70000-0x000007FEF665C000-memory.dmp

Filesize
9.9MB

Download
memory/1924-10-0x000007FEF5C70000-0x000007FEF665C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-9-0x0000000000BB0000-0x0000000000ED4000-memory.dmp

Filesize
3.1MB

Download
memory/2668-11-0x000007FEF5C70000-0x000007FEF665C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-8-0x000007FEF5C70000-0x000007FEF665C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-12-0x000007FEF5C70000-0x000007FEF665C000-memory.dmp

Filesize
9.9MB

Download