quasar | 6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e

General

Target

plswork.exe
Size

502KB
MD5

71685fb1a3701f1e27e48ba3e3ce9530
SHA1

f460a9ecc7e35b4691532bc6c647dbe3973a51ca
SHA256

6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e
SHA512

3a7505c3faacf6f3e113570545767757d2db5aa342023a4eea27e49e4d632a0064a957c6b07f950e727dd71b8262b768626521cf1d1fbb195fd36d7db7bf5c5a
SSDEEP

12288:9TEgdfY2xUJkhPPck43yw7VpDZx68Vcde:eUwtOoyw7VpDZdcde

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

137.184.144.245:4782

Mutex

6cfe4a65-c41d-4b02-9ae9-e727a748ae84

Attributes

encryption_key
B702BA239316FCF317B584A351F2EC1696EBE772
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2504-1-0x0000000000030000-0x00000000000B4000-memory.dmp	family_quasar
behavioral1/files/0x0007000000018718-5.dat	family_quasar
behavioral1/memory/2312-8-0x0000000000830000-0x00000000008B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2312	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	plswork.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	plswork.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
2392	schtasks.exe
792	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2504	plswork.exe
Token: SeDebugPrivilege	2312	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2312	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2312	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2312	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2504 wrote to memory of 2392	2504	plswork.exe	30
PID 2504 wrote to memory of 2392	2504	plswork.exe	30
PID 2504 wrote to memory of 2392	2504	plswork.exe	30
PID 2504 wrote to memory of 2312	2504	plswork.exe	32
PID 2504 wrote to memory of 2312	2504	plswork.exe	32
PID 2504 wrote to memory of 2312	2504	plswork.exe	32
PID 2312 wrote to memory of 792	2312	Client.exe	33
PID 2312 wrote to memory of 792	2312	Client.exe	33
PID 2312 wrote to memory of 792	2312	Client.exe	33

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\plswork.exe
"C:\Users\Admin\AppData\Local\Temp\plswork.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2504
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\plswork.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2392
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.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:2312
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:792

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\Client.exe

Filesize
502KB

MD5
71685fb1a3701f1e27e48ba3e3ce9530

SHA1
f460a9ecc7e35b4691532bc6c647dbe3973a51ca

SHA256
6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e

SHA512
3a7505c3faacf6f3e113570545767757d2db5aa342023a4eea27e49e4d632a0064a957c6b07f950e727dd71b8262b768626521cf1d1fbb195fd36d7db7bf5c5a

Download Submit
memory/2312-10-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2312-9-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2312-8-0x0000000000830000-0x00000000008B4000-memory.dmp

Filesize
528KB

Download
memory/2312-11-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2504-0-0x000007FEF5A03000-0x000007FEF5A04000-memory.dmp

Filesize
4KB

Download
memory/2504-1-0x0000000000030000-0x00000000000B4000-memory.dmp

Filesize
528KB

Download
memory/2504-2-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2504-7-0x000007FEF5A00000-0x000007FEF63EC000-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