quasar | 148ba895996273e5b245a9764c65b18187186084105a3d037e12a48940d78684

Analysis

max time kernel
149s
max time network
150s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
18-05-2024 21:56

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General

Target

SkermEXEC.exe
Size

3.1MB
MD5

d2684b91635d1e6367f3afcc5f69704f
SHA1

e11f64b35a4d006abcf3218c2b16350fa1811d37
SHA256

148ba895996273e5b245a9764c65b18187186084105a3d037e12a48940d78684
SHA512

06a7d6154c51c7a2f5dcdb6473a5c0122c568b852613e38e7359bd345cbb7f0ac511fb13c8d54c01ca309866208aa0e1ec4a738953050b52d34903feb7dc59d7
SSDEEP

49152:KvWI22SsaNYfdPBldt698dBcjHV5Ro6nbR3LoGduTTHHB72eh2NT:Kv722SsaNYfdPBldt6+dBcjHV5Ro65

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

104.28.197.26:4782

Mutex

f195a5f9-5b8a-4ef1-ba41-ce79c45d3dad

Attributes

encryption_key
AAD5CB2ED96AC29ECF5D4BB5B9A38449017E4CAA
install_name
SkermEXEC.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 payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4268-1-0x0000000000520000-0x0000000000844000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

SkermEXEC.exe

pid process

4916 SkermEXEC.exe
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

3184 schtasks.exe
4620 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

SkermEXEC.exeSkermEXEC.exe

description pid process

Token: SeDebugPrivilege 4268 SkermEXEC.exe
Token: SeDebugPrivilege 4916 SkermEXEC.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

SkermEXEC.exe

pid process

4916 SkermEXEC.exe

pid	process
4916	SkermEXEC.exe

pid	process
3184	schtasks.exe
4620	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4268	SkermEXEC.exe
Token: SeDebugPrivilege	4916	SkermEXEC.exe

pid	process
4916	SkermEXEC.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

SkermEXEC.exeSkermEXEC.exe

description	pid	process	target process
PID 4268 wrote to memory of 3184	4268	SkermEXEC.exe	schtasks.exe
PID 4268 wrote to memory of 3184	4268	SkermEXEC.exe	schtasks.exe
PID 4268 wrote to memory of 4916	4268	SkermEXEC.exe	SkermEXEC.exe
PID 4268 wrote to memory of 4916	4268	SkermEXEC.exe	SkermEXEC.exe
PID 4916 wrote to memory of 4620	4916	SkermEXEC.exe	schtasks.exe
PID 4916 wrote to memory of 4620	4916	SkermEXEC.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\SkermEXEC.exe
"C:\Users\Admin\AppData\Local\Temp\SkermEXEC.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4268

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3184

C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe
"C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4916

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4620

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

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\SkermEXEC.exe.log

Filesize
1KB

MD5
d63ff49d7c92016feb39812e4db10419

SHA1
2307d5e35ca9864ffefc93acf8573ea995ba189b

SHA256
375076241775962f3edc08a8c72832a00920b427a4f3332528d91d21e909fa12

SHA512
00f8c8d0336d6575b956876183199624d6f4d2056f2c0aa633a6f17c516f22ee648062d9bc419254d84c459323e9424f0da8aed9dd4e16c2926e5ba30e797d8a

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe

Filesize
3.1MB

MD5
d2684b91635d1e6367f3afcc5f69704f

SHA1
e11f64b35a4d006abcf3218c2b16350fa1811d37

SHA256
148ba895996273e5b245a9764c65b18187186084105a3d037e12a48940d78684

SHA512
06a7d6154c51c7a2f5dcdb6473a5c0122c568b852613e38e7359bd345cbb7f0ac511fb13c8d54c01ca309866208aa0e1ec4a738953050b52d34903feb7dc59d7

Download Submit
memory/4268-1-0x0000000000520000-0x0000000000844000-memory.dmp

Filesize
3.1MB

Download
memory/4268-0-0x00007FFE9F3C3000-0x00007FFE9F3C4000-memory.dmp

Filesize
4KB

Download
memory/4268-2-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download
memory/4268-9-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download
memory/4916-10-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download
memory/4916-11-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download
memory/4916-12-0x000000001B4E0000-0x000000001B530000-memory.dmp

Filesize
320KB

Download
memory/4916-13-0x000000001BAC0000-0x000000001BB72000-memory.dmp

Filesize
712KB

Download
memory/4916-14-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download
memory/4916-15-0x00007FFE9F3C0000-0x00007FFE9FDAC000-memory.dmp

Filesize
9.9MB

Download