quasar | a96753e9b56838926ac13f3cae923fd23f6748403c213de36ec768b6a234bdbd

General

Target

SkermEXEC.exe
Size

3.1MB
MD5

9f267d872494cb059bdeb6b2c30d612f
SHA1

2a67dda167cd4872717fbdaa868bf7f3c7b4333f
SHA256

a96753e9b56838926ac13f3cae923fd23f6748403c213de36ec768b6a234bdbd
SHA512

833a1211990f9aece09606316903dfc7d10297d7d2521fb3d049d2c0d92ef7f3de3e0f360f8582810d169caf082e1f7c950ec89d96be1a46133c3975cfcbb136
SSDEEP

49152:CvbI22SsaNYfdPBldt698dBcjHB2OmZmznEoGdsTHHB72eh2NT:Cvk22SsaNYfdPBldt6+dBcjHgOm5

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

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/3468-0-0x0000000000910000-0x0000000000C34000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\SkermEXEC.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

SkermEXEC.exe

pid process

4516 SkermEXEC.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

4664 schtasks.exe
4328 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

SkermEXEC.exeSkermEXEC.exe

description pid process

Token: SeDebugPrivilege 3468 SkermEXEC.exe
Token: SeDebugPrivilege 4516 SkermEXEC.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

SkermEXEC.exe

pid process

4516 SkermEXEC.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

SkermEXEC.exe

pid process

4516 SkermEXEC.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

SkermEXEC.exe

pid process

4516 SkermEXEC.exe

pid	process
4516	SkermEXEC.exe

pid	process
4664	schtasks.exe
4328	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3468	SkermEXEC.exe
Token: SeDebugPrivilege	4516	SkermEXEC.exe

pid	process
4516	SkermEXEC.exe

pid	process
4516	SkermEXEC.exe

pid	process
4516	SkermEXEC.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

SkermEXEC.exeSkermEXEC.exe

description	pid	process	target process
PID 3468 wrote to memory of 4664	3468	SkermEXEC.exe	schtasks.exe
PID 3468 wrote to memory of 4664	3468	SkermEXEC.exe	schtasks.exe
PID 3468 wrote to memory of 4516	3468	SkermEXEC.exe	SkermEXEC.exe
PID 3468 wrote to memory of 4516	3468	SkermEXEC.exe	SkermEXEC.exe
PID 4516 wrote to memory of 4328	4516	SkermEXEC.exe	schtasks.exe
PID 4516 wrote to memory of 4328	4516	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:3468

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:4664

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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4516

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:4328

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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
9f267d872494cb059bdeb6b2c30d612f

SHA1
2a67dda167cd4872717fbdaa868bf7f3c7b4333f

SHA256
a96753e9b56838926ac13f3cae923fd23f6748403c213de36ec768b6a234bdbd

SHA512
833a1211990f9aece09606316903dfc7d10297d7d2521fb3d049d2c0d92ef7f3de3e0f360f8582810d169caf082e1f7c950ec89d96be1a46133c3975cfcbb136

Download Submit
memory/3468-1-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download
memory/3468-2-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download
memory/3468-0-0x0000000000910000-0x0000000000C34000-memory.dmp

Filesize
3.1MB

Download
memory/3468-9-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download
memory/4516-10-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download
memory/4516-11-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download
memory/4516-13-0x000000001C750000-0x000000001C802000-memory.dmp

Filesize
712KB

Download
memory/4516-12-0x000000001C640000-0x000000001C690000-memory.dmp

Filesize
320KB

Download
memory/4516-14-0x00007FFA4A830000-0x00007FFA4AA0B000-memory.dmp

Filesize
1.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads