quasar | e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b

General

Target

Client-built.exe
Size

3.1MB
MD5

30fe4e7e33259e52666ca6cd6eb12ee3
SHA1

c5c8506ba00e9416197d39149394fceacf3551ac
SHA256

e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b
SHA512

67647d16e50623fc2019a0c88295c7d1dfe715b00cce6d3e15098f2b668e55dfc3e62a1d27cdf8f68f2c2a770b1f83c8d7ec28c03fa627f03e9984f62ef46bd8
SSDEEP

49152:rvbI22SsaNYfdPBldt698dBcjHidimwmzstoGdaTHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjHWim+

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

184.98.230.97:4545

Mutex

381fb32a-fd3f-4701-8fca-4b51cb0abac7

Attributes

encryption_key
9D21D822B3655AB7418E123B9807F485C0122440
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Antivirus
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/2000-1-0x0000000001140000-0x0000000001464000-memory.dmp	family_quasar
behavioral1/files/0x0008000000018741-5.dat	family_quasar
behavioral1/memory/2344-9-0x0000000000380000-0x00000000006A4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2344	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.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
2224	schtasks.exe
2780	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2000	Client-built.exe
Token: SeDebugPrivilege	2344	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2344	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2344	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2344	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2000 wrote to memory of 2224	2000	Client-built.exe	30
PID 2000 wrote to memory of 2224	2000	Client-built.exe	30
PID 2000 wrote to memory of 2224	2000	Client-built.exe	30
PID 2000 wrote to memory of 2344	2000	Client-built.exe	32
PID 2000 wrote to memory of 2344	2000	Client-built.exe	32
PID 2000 wrote to memory of 2344	2000	Client-built.exe	32
PID 2344 wrote to memory of 2780	2344	Client.exe	33
PID 2344 wrote to memory of 2780	2344	Client.exe	33
PID 2344 wrote to memory of 2780	2344	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2000
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Windows Antivirus " /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2224
- 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:2344
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Windows Antivirus " /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2780

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
3.1MB

MD5
30fe4e7e33259e52666ca6cd6eb12ee3

SHA1
c5c8506ba00e9416197d39149394fceacf3551ac

SHA256
e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b

SHA512
67647d16e50623fc2019a0c88295c7d1dfe715b00cce6d3e15098f2b668e55dfc3e62a1d27cdf8f68f2c2a770b1f83c8d7ec28c03fa627f03e9984f62ef46bd8

Download Submit
memory/2000-0-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download
memory/2000-1-0x0000000001140000-0x0000000001464000-memory.dmp

Filesize
3.1MB

Download
memory/2000-2-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2000-7-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2344-8-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2344-9-0x0000000000380000-0x00000000006A4000-memory.dmp

Filesize
3.1MB

Download
memory/2344-10-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2344-11-0x000007FEF5EA0000-0x000007FEF688C000-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