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 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/764-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c93-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

host.exe

pid	Process
2912	host.exe

Drops file in System32 directory 5 IoCs

Processes:

host.exe561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe

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

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

Processes:

schtasks.exeschtasks.exe

pid	Process
2796	schtasks.exe
304	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exehost.exe

description	pid	Process
Token: SeDebugPrivilege	764	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe
Token: SeDebugPrivilege	2912	host.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

host.exe

pid	Process
2912	host.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

host.exe

pid	Process
2912	host.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exehost.exe

description	pid	Process	procid_target
PID 764 wrote to memory of 2796	764	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	87
PID 764 wrote to memory of 2796	764	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	87
PID 764 wrote to memory of 2912	764	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	89
PID 764 wrote to memory of 2912	764	561fe5209e54e0c91eb8faf5632e3315815770d58e89bc50677bdb1f944bd89a.exe	89
PID 2912 wrote to memory of 304	2912	host.exe	90
PID 2912 wrote to memory of 304	2912	host.exe	90

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:764
- 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:2796
- 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:2912
- - 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:304

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/764-0-0x00007FF9DB8B3000-0x00007FF9DB8B5000-memory.dmp

Filesize
8KB

Download
memory/764-1-0x0000000000AF0000-0x0000000000E14000-memory.dmp

Filesize
3.1MB

Download
memory/764-2-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/764-10-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/2912-9-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/2912-11-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/2912-12-0x000000001C280000-0x000000001C2D0000-memory.dmp

Filesize
320KB

Download
memory/2912-13-0x000000001C390000-0x000000001C442000-memory.dmp

Filesize
712KB

Download
memory/2912-14-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads