quasar | d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1

General

Target

Client-built.exe
Size

3.1MB
MD5

e7b38e84926048dd156d4c246675823a
SHA1

40ab7eaffb7b098e736ade0eee720856c3e38cd9
SHA256

d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1
SHA512

e74a37e088f36ad656b86907999c2178c7868803e964acc74cfe54fef6ae7e1f845ebad470655dd896c03d6679e9a7d5a07791bb2b796c6355bf989b57e3ba9f
SSDEEP

49152:rvVG42pda6D+/PjlLOlg6yQipVhQg7vbR6LoGd8xTHHB72eh2NT:rvM42pda6D+/PjlLOlZyQipVh37K

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.208.1:7672

127.000.1:7672

192.168.208.1:37664

Mutex

43703048-944d-4b25-8c70-d875b0b3b227

Attributes

encryption_key
62FBCC4DFDC2A6A90B45D09307BE1ECC156199ED
install_name
Client.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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1048-1-0x00000000008F0000-0x0000000000C14000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cba-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4196	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	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
3236	schtasks.exe
4000	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1048	Client-built.exe
Token: SeDebugPrivilege	4196	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4196	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4196	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4196	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 3236	1048	Client-built.exe	82
PID 1048 wrote to memory of 3236	1048	Client-built.exe	82
PID 1048 wrote to memory of 4196	1048	Client-built.exe	84
PID 1048 wrote to memory of 4196	1048	Client-built.exe	84
PID 4196 wrote to memory of 4000	4196	Client.exe	85
PID 4196 wrote to memory of 4000	4196	Client.exe	85

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:1048
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3236
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4196
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4000

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
e7b38e84926048dd156d4c246675823a

SHA1
40ab7eaffb7b098e736ade0eee720856c3e38cd9

SHA256
d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1

SHA512
e74a37e088f36ad656b86907999c2178c7868803e964acc74cfe54fef6ae7e1f845ebad470655dd896c03d6679e9a7d5a07791bb2b796c6355bf989b57e3ba9f

Download Submit
memory/1048-0-0x00007FFCA5843000-0x00007FFCA5845000-memory.dmp

Filesize
8KB

Download
memory/1048-1-0x00000000008F0000-0x0000000000C14000-memory.dmp

Filesize
3.1MB

Download
memory/1048-2-0x00007FFCA5840000-0x00007FFCA6301000-memory.dmp

Filesize
10.8MB

Download
memory/1048-9-0x00007FFCA5840000-0x00007FFCA6301000-memory.dmp

Filesize
10.8MB

Download
memory/4196-10-0x00007FFCA5840000-0x00007FFCA6301000-memory.dmp

Filesize
10.8MB

Download
memory/4196-11-0x00007FFCA5840000-0x00007FFCA6301000-memory.dmp

Filesize
10.8MB

Download
memory/4196-12-0x000000001C310000-0x000000001C360000-memory.dmp

Filesize
320KB

Download
memory/4196-13-0x000000001C420000-0x000000001C4D2000-memory.dmp

Filesize
712KB

Download
memory/4196-14-0x00007FFCA5840000-0x00007FFCA6301000-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