quasar | 7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

General

Target

Client-built.exe
Size

3.1MB
MD5

85b177add44a49f07c6610191c064bbc
SHA1

7766290221b9dafd7c0d6d983070f55863ed1b26
SHA256

7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb
SHA512

0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798
SSDEEP

49152:TvChBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkaUEGiBeHLoVd2THHB72eh2NT:Tv8t2d5aKCuVPzlEmVQ0wvwf/Gp

Score

10^/10

quasar ratted spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ratted

C2

localhost:4782

87.97.126.177:4782

Mutex

48887e39-00c3-4c7d-9fbd-aa9bee5b1a88

Attributes

encryption_key
CD36E224C70A801E8033FBB0E5129B1EA712AE1D
install_name
Windows Font Manager.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Font Manager
subdirectory
Fonts

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/2644-1-0x0000000000B40000-0x0000000000E64000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d71-6.dat	family_quasar
behavioral1/memory/2836-9-0x0000000000A00000-0x0000000000D24000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2836	Windows Font Manager.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\Fonts\Windows Font Manager.exe	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts\Windows Font Manager.exe	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts\Windows Font Manager.exe	Windows Font Manager.exe
File opened for modification	C:\Windows\system32\Fonts	Windows Font Manager.exe

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
2668	schtasks.exe
2700	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	Client-built.exe
Token: SeDebugPrivilege	2836	Windows Font Manager.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 2700	2644	Client-built.exe	30
PID 2644 wrote to memory of 2700	2644	Client-built.exe	30
PID 2644 wrote to memory of 2700	2644	Client-built.exe	30
PID 2644 wrote to memory of 2836	2644	Client-built.exe	32
PID 2644 wrote to memory of 2836	2644	Client-built.exe	32
PID 2644 wrote to memory of 2836	2644	Client-built.exe	32
PID 2836 wrote to memory of 2668	2836	Windows Font Manager.exe	33
PID 2836 wrote to memory of 2668	2836	Windows Font Manager.exe	33
PID 2836 wrote to memory of 2668	2836	Windows Font Manager.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:2644
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2700
- C:\Windows\system32\Fonts\Windows Font Manager.exe
  "C:\Windows\system32\Fonts\Windows Font Manager.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2836
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2668

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\System32\Fonts\Windows Font Manager.exe

Filesize
3.1MB

MD5
85b177add44a49f07c6610191c064bbc

SHA1
7766290221b9dafd7c0d6d983070f55863ed1b26

SHA256
7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

SHA512
0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798

Download Submit
memory/2644-0-0x000007FEF5DC3000-0x000007FEF5DC4000-memory.dmp

Filesize
4KB

Download
memory/2644-1-0x0000000000B40000-0x0000000000E64000-memory.dmp

Filesize
3.1MB

Download
memory/2644-2-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2644-8-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2836-9-0x0000000000A00000-0x0000000000D24000-memory.dmp

Filesize
3.1MB

Download
memory/2836-10-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2836-11-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download
memory/2836-12-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads