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 2 IoCs

resource	yara_rule
behavioral2/memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp	family_quasar
behavioral2/files/0x00070000000233bc-5.dat	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

resource	yara_rule
behavioral2/memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/files/0x00070000000233bc-5.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

resource	yara_rule
behavioral2/memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/files/0x00070000000233bc-5.dat	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

resource	yara_rule
behavioral2/memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral2/files/0x00070000000233bc-5.dat	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

pid	Process
436	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
2128	schtasks.exe
1868	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	944	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
Token: SeDebugPrivilege	436	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
436	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 944 wrote to memory of 2128	944	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	89
PID 944 wrote to memory of 2128	944	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	89
PID 944 wrote to memory of 436	944	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	91
PID 944 wrote to memory of 436	944	8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe	91
PID 436 wrote to memory of 1868	436	Client.exe	93
PID 436 wrote to memory of 1868	436	Client.exe	93

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:944
- 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:2128
- 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:436
- - 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:1868

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

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
c52e8cb313bd0e446cb9607636bbc6ec

SHA1
77d3ca1584e486528e39802449027cd9e8b08b83

SHA256
8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583

SHA512
d8bdbad8a179c74f2479da58af5530782a1683e07ad656b91ee05b0b00daa8008d1e7143b34eae16ef6ef612e1f742832ae9b9167ac2286799075886d1a66a45

Download Submit
memory/436-9-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

Filesize
10.8MB

Download
memory/436-10-0x0000000001360000-0x0000000001370000-memory.dmp

Filesize
64KB

Download
memory/436-11-0x0000000002D40000-0x0000000002D90000-memory.dmp

Filesize
320KB

Download
memory/436-12-0x000000001C440000-0x000000001C4F2000-memory.dmp

Filesize
712KB

Download
memory/436-13-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

Filesize
10.8MB

Download
memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp

Filesize
3.1MB

Download
memory/944-1-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

Filesize
10.8MB

Download
memory/944-2-0x000000001B4A0000-0x000000001B4B0000-memory.dmp

Filesize
64KB

Download
memory/944-8-0x00007FFC5BBE0000-0x00007FFC5C6A1000-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