quasar | 8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583

General

Target

8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
Size

3.1MB
MD5

c52e8cb313bd0e446cb9607636bbc6ec
SHA1

77d3ca1584e486528e39802449027cd9e8b08b83
SHA256

8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583
SHA512

d8bdbad8a179c74f2479da58af5530782a1683e07ad656b91ee05b0b00daa8008d1e7143b34eae16ef6ef612e1f742832ae9b9167ac2286799075886d1a66a45
SSDEEP

49152:KvWI22SsaNYfdPBldt698dBcjHS5RJ6PbR3LoGdBTHHB72eh2NT:Kv722SsaNYfdPBldt6+dBcjHS5RJ6h

Score

10^/10

quasar victim spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

victim

C2

192.168.56.1:4782

Mutex

f887c652-41ce-4f9e-8a72-52676eb54001

Attributes

encryption_key
194B648FB0D06C59B36705385FF44BFC616F014E
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 payload 3 IoCs

resource	yara_rule
behavioral1/memory/2276-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp	family_quasar
behavioral1/files/0x000800000001220a-5.dat	family_quasar
behavioral1/memory/2588-8-0x00000000003D0000-0x00000000006F4000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

resource	yara_rule
behavioral1/memory/2276-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x000800000001220a-5.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2588-8-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

resource	yara_rule
behavioral1/memory/2276-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/files/0x000800000001220a-5.dat	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/2588-8-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

resource	yara_rule
behavioral1/memory/2276-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/files/0x000800000001220a-5.dat	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/2588-8-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

pid	Process
2588	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2072	schtasks.exe
2640	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
Token: SeDebugPrivilege	2588	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2588	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 2072	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	28
PID 2276 wrote to memory of 2072	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	28
PID 2276 wrote to memory of 2072	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	28
PID 2276 wrote to memory of 2588	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	30
PID 2276 wrote to memory of 2588	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	30
PID 2276 wrote to memory of 2588	2276	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	30
PID 2588 wrote to memory of 2640	2588	Client.exe	31
PID 2588 wrote to memory of 2640	2588	Client.exe	31
PID 2588 wrote to memory of 2640	2588	Client.exe	31

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\8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
"C:\Users\Admin\AppData\Local\Temp\8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2276
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2072
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2588
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2640

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

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\SubDir\Client.exe

Filesize
3.1MB

MD5
c52e8cb313bd0e446cb9607636bbc6ec

SHA1
77d3ca1584e486528e39802449027cd9e8b08b83

SHA256
8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583

SHA512
d8bdbad8a179c74f2479da58af5530782a1683e07ad656b91ee05b0b00daa8008d1e7143b34eae16ef6ef612e1f742832ae9b9167ac2286799075886d1a66a45

Download Submit
memory/2276-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp

Filesize
3.1MB

Download
memory/2276-1-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

Filesize
9.9MB

Download
memory/2276-2-0x000000001AB40000-0x000000001ABC0000-memory.dmp

Filesize
512KB

Download
memory/2276-9-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

Filesize
9.9MB

Download
memory/2588-7-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

Filesize
9.9MB

Download
memory/2588-8-0x00000000003D0000-0x00000000006F4000-memory.dmp

Filesize
3.1MB

Download
memory/2588-10-0x000000001B210000-0x000000001B290000-memory.dmp

Filesize
512KB

Download
memory/2588-11-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

Filesize
9.9MB

Download
memory/2588-12-0x000000001B210000-0x000000001B290000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads