quasar | 0519a93b01b9929423e8313cc6f425f596d19ace6e81d0d3d3749703fc236188

General

Target

Client-built.exe
Size

342KB
MD5

0b0287fdaa9bea5c3289fee8e4677e46
SHA1

5f2dcbfd4348c88f772d8b50746f7ba989aade90
SHA256

5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872
SHA512

420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592
SSDEEP

6144:f0N453rTzUAGKXIl3q09GeRpeP6aqSAXAkacT73/GVzebSfMgMtRz:f0N41zUiIl3f9GeRq6aqSAXAkp73Szm3

Score

10^/10

quasar persistence spyware trojan

Malware Config

Signatures

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

Executes dropped EXE 4 IoCs

pid	Process
1684	Start.exe
2884	Start.exe
4388	Start.exe
2004	Start.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	Start.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Quasar Client Startup = "\"C:\\Users\\Admin\\AppData\\Roaming\\Python\\Start.exe\""	Start.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
5	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
4004	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4828	Client-built.exe
Token: SeDebugPrivilege	1684	Start.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4828 wrote to memory of 1684	4828	Client-built.exe	82
PID 4828 wrote to memory of 1684	4828	Client-built.exe	82
PID 1684 wrote to memory of 4004	1684	Start.exe	83
PID 1684 wrote to memory of 4004	1684	Start.exe	83

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4828
- C:\Users\Admin\AppData\Roaming\Python\Start.exe
  "C:\Users\Admin\AppData\Roaming\Python\Start.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1684
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Users\Admin\AppData\Roaming\Python\Start.exe" /sc MINUTE /MO 1
    3⤵
    - Creates scheduled task(s)
    PID:4004

C:\Users\Admin\AppData\Roaming\Python\Start.exe
C:\Users\Admin\AppData\Roaming\Python\Start.exe
1⤵
- Executes dropped EXE
PID:2884

C:\Users\Admin\AppData\Roaming\Python\Start.exe
C:\Users\Admin\AppData\Roaming\Python\Start.exe
1⤵
- Executes dropped EXE
PID:4388

C:\Users\Admin\AppData\Roaming\Python\Start.exe
C:\Users\Admin\AppData\Roaming\Python\Start.exe
1⤵
- Executes dropped EXE
PID:2004

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Start.exe.log

Filesize
1KB

MD5
2362dcc9d262d0969898b143fb7fc91a

SHA1
2240860a675c86425f5702b501eac121bfb744eb

SHA256
4f7cff601d97caf1e0040bc2d63ccadd27294b2e551ff4167e0b080c69a915b0

SHA512
59cb7e53dc9cc02f25216cc87115403ed67fb5d24947ef2e803cd54e9f118d5d65a71817b05642c238ca48eb7bfd228d008d92e42023f2c15755c64c88f5b0d6

Download Submit
C:\Users\Admin\AppData\Roaming\Python\Start.exe

Filesize
342KB

MD5
0b0287fdaa9bea5c3289fee8e4677e46

SHA1
5f2dcbfd4348c88f772d8b50746f7ba989aade90

SHA256
5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872

SHA512
420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592

Download Submit
C:\Users\Admin\AppData\Roaming\Python\Start.exe

Filesize
342KB

MD5
0b0287fdaa9bea5c3289fee8e4677e46

SHA1
5f2dcbfd4348c88f772d8b50746f7ba989aade90

SHA256
5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872

SHA512
420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592

Download Submit
C:\Users\Admin\AppData\Roaming\Python\Start.exe

Filesize
342KB

MD5
0b0287fdaa9bea5c3289fee8e4677e46

SHA1
5f2dcbfd4348c88f772d8b50746f7ba989aade90

SHA256
5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872

SHA512
420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592

Download Submit
C:\Users\Admin\AppData\Roaming\Python\Start.exe

Filesize
342KB

MD5
0b0287fdaa9bea5c3289fee8e4677e46

SHA1
5f2dcbfd4348c88f772d8b50746f7ba989aade90

SHA256
5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872

SHA512
420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592

Download Submit
C:\Users\Admin\AppData\Roaming\Python\Start.exe

Filesize
342KB

MD5
0b0287fdaa9bea5c3289fee8e4677e46

SHA1
5f2dcbfd4348c88f772d8b50746f7ba989aade90

SHA256
5b045134161e8922ea16d3aae401edbe088113690fa7aacacb274481150f8872

SHA512
420cfb68b777c0acb94566e9adb04b0fb89ff41d0f517cb51d8a3e3de7c03c38a48662c964ab92c0a0e082fe39a636ac69bbe0c4144ef2bafc329a7c5bea7592

Download Submit
memory/1684-140-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/1684-142-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/2004-151-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/2004-152-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/2884-145-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/2884-144-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/4388-148-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/4388-149-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/4828-132-0x0000000000EA0000-0x0000000000EA8000-memory.dmp

Filesize
32KB

Download
memory/4828-134-0x00000000030B0000-0x00000000030C2000-memory.dmp

Filesize
72KB

Download
memory/4828-133-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download
memory/4828-135-0x000000001CBB0000-0x000000001CBEC000-memory.dmp

Filesize
240KB

Download
memory/4828-139-0x00007FFA4A0B0000-0x00007FFA4AB71000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads