quasar | aebe8489a53693d4466be30dfd930c2cbc79a21687b228a8f304815906de02d6

General

Target

RobloxCrasher.exe
Size

3.2MB
MD5

ebda07e93515d2a92cf0f34bee690b43
SHA1

56b44e24857999dc97a26b7b8d9044b1235fd167
SHA256

aebe8489a53693d4466be30dfd930c2cbc79a21687b228a8f304815906de02d6
SHA512

f3c01b7cae001b3630aa4959844724368e8f7244630a4867758d310c9b5f60a17b471ef84df356539ce5e4eb6d6ac9577b1e4a0c71e24826a8da0a84ff2ed54e
SSDEEP

98304:isdJl5i8RDSoqm7GvvZX7BnmrcdMWu2tVKsL:3Jl5jyGyVmrCMWjtMsL

Score

10^/10

quasar roblox defense_evasion spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Roblox

C2

bigchancepenis.bounceme.net:9000

Mutex

e293c679-127e-4679-9d5e-f004c0e21f2b

Attributes

encryption_key
693B804C4C15D633359B0059C08E017241D484D5
install_name
Roblox.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows34
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/files/0x0017000000023c49-7.dat	family_quasar
behavioral2/memory/2124-14-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar

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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	RobloxCrasher.exe

Executes dropped EXE 2 IoCs

pid	Process
2124	client test.exe
4184	Roblox.exe

Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010
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
372	schtasks.exe
3032	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3872	powershell.exe
3872	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2124	client test.exe
Token: SeDebugPrivilege	3872	powershell.exe
Token: SeDebugPrivilege	4184	Roblox.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4184	Roblox.exe
4184	Roblox.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
4184	Roblox.exe
4184	Roblox.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4184	Roblox.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 3872	2184	RobloxCrasher.exe	83
PID 2184 wrote to memory of 3872	2184	RobloxCrasher.exe	83
PID 2184 wrote to memory of 2124	2184	RobloxCrasher.exe	86
PID 2184 wrote to memory of 2124	2184	RobloxCrasher.exe	86
PID 2124 wrote to memory of 372	2124	client test.exe	90
PID 2124 wrote to memory of 372	2124	client test.exe	90
PID 2124 wrote to memory of 4184	2124	client test.exe	92
PID 2124 wrote to memory of 4184	2124	client test.exe	92
PID 4184 wrote to memory of 3032	4184	Roblox.exe	96
PID 4184 wrote to memory of 3032	4184	Roblox.exe	96

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\RobloxCrasher.exe
"C:\Users\Admin\AppData\Local\Temp\RobloxCrasher.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2184
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGMAaABqACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAG0AcgB5ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHgAbgB6ACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGwAcwB3ACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3872
- C:\Users\Admin\AppData\Local\Temp\client test.exe
  "C:\Users\Admin\AppData\Local\Temp\client test.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2124
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows34" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:372
- - C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4184
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows34" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3032

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

Obfuscated Files or Information

1

T1027

Command Obfuscation

1

T1027.010

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zfzkj4fy.ick.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\client test.exe

Filesize
3.1MB

MD5
84c114e30ffae2eec6622b07d65908b5

SHA1
eef279f6dd170eeec669c9732e53a7bfbbf37aac

SHA256
d9e1552be4eaa09f9ce2e7adf76e3b80ba5be5f08b1254028bb70c95243ba8b4

SHA512
26922bc1ba7465e910455e0fb9b285ca689ef74e240ebb5343cc9119ce0d20775a02f3da6c464d17bb98c6ce0fca3c4490a590ad3b671181448c9dd9f4983887

Download Submit
memory/2124-17-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/2124-37-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/2124-14-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/2124-15-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/2184-33-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/2184-2-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/2184-0-0x00007FFD14343000-0x00007FFD14345000-memory.dmp

Filesize
8KB

Download
memory/2184-1-0x0000000000C60000-0x0000000000F8E000-memory.dmp

Filesize
3.2MB

Download
memory/3872-16-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/3872-18-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/3872-28-0x0000021CD8980000-0x0000021CD89A2000-memory.dmp

Filesize
136KB

Download
memory/3872-32-0x00007FFD14340000-0x00007FFD14E01000-memory.dmp

Filesize
10.8MB

Download
memory/4184-39-0x000000001C780000-0x000000001C7D0000-memory.dmp

Filesize
320KB

Download
memory/4184-40-0x000000001C890000-0x000000001C942000-memory.dmp

Filesize
712KB

Download
memory/4184-43-0x000000001C810000-0x000000001C822000-memory.dmp

Filesize
72KB

Download
memory/4184-44-0x000000001D390000-0x000000001D3CC000-memory.dmp

Filesize
240KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads