quasar | 561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a

General

Target

561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
Size

3.1MB
MD5

0e6a30b700d0b417f85f1c6999ba9c50
SHA1

13dd35f54be0d55129dbba314c5ee18051197845
SHA256

561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a
SHA512

11d3cfa1f39da2c799e257c8d58e1dd882141999323b068870ce03f0cbc437bb9747f33da9bea3411f7698afff6a7c9e9684eefbbafafb3e45ef6439204bdfa6
SSDEEP

49152:Ovgt62XlaSFNWPjljiFa2RoUYIZP6u1JBLVGdd/THHB72eh2NT:OvM62XlaSFNWPjljiFXRoUYIZP6M

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.50:4782

Mutex

ea8c66bf-4707-4c3b-be32-09615e135089

Attributes

encryption_key
674CB9EB9E67A692B751A2EA5BB781A3ECA74C67
install_name
host.exe
log_directory
Logs
reconnect_delay
3000
startup_key
host
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2544-1-0x0000000000240000-0x0000000000564000-memory.dmp	family_quasar
behavioral1/files/0x000700000001939b-6.dat	family_quasar
behavioral1/memory/2712-9-0x0000000000100000-0x0000000000424000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2712	host.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\host.exe	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
File opened for modification	C:\Windows\system32\SubDir\host.exe	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
File opened for modification	C:\Windows\system32\SubDir	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
File opened for modification	C:\Windows\system32\SubDir\host.exe	host.exe
File opened for modification	C:\Windows\system32\SubDir	host.exe

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

System Information Discovery
T1082

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
3020	schtasks.exe
2812	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
Token: SeDebugPrivilege	2712	host.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2712	host.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2712	host.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2544 wrote to memory of 3020	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	29
PID 2544 wrote to memory of 3020	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	29
PID 2544 wrote to memory of 3020	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	29
PID 2544 wrote to memory of 2712	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	31
PID 2544 wrote to memory of 2712	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	31
PID 2544 wrote to memory of 2712	2544	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	31
PID 2712 wrote to memory of 2812	2712	host.exe	32
PID 2712 wrote to memory of 2812	2712	host.exe	32
PID 2712 wrote to memory of 2812	2712	host.exe	32

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\561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
"C:\Users\Admin\AppData\Local\Temp\561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2544
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "host" /sc ONLOGON /tr "C:\Windows\system32\SubDir\host.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3020
- C:\Windows\system32\SubDir\host.exe
  "C:\Windows\system32\SubDir\host.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2712
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "host" /sc ONLOGON /tr "C:\Windows\system32\SubDir\host.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2812

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

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:\Windows\System32\SubDir\host.exe

Filesize
3.1MB

MD5
0e6a30b700d0b417f85f1c6999ba9c50

SHA1
13dd35f54be0d55129dbba314c5ee18051197845

SHA256
561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a

SHA512
11d3cfa1f39da2c799e257c8d58e1dd882141999323b068870ce03f0cbc437bb9747f33da9bea3411f7698afff6a7c9e9684eefbbafafb3e45ef6439204bdfa6

Download Submit
memory/2544-0-0x000007FEF5643000-0x000007FEF5644000-memory.dmp

Filesize
4KB

Download
memory/2544-1-0x0000000000240000-0x0000000000564000-memory.dmp

Filesize
3.1MB

Download
memory/2544-2-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2544-8-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2712-10-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2712-9-0x0000000000100000-0x0000000000424000-memory.dmp

Filesize
3.1MB

Download
memory/2712-11-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download
memory/2712-12-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads