quasar | e19ec4fa8dcc4d92b63bf6e5d4b9c519032799fec8fb7d5634adf34d954f067b

General

Target

Bootstrapper.exe
Size

3.1MB
MD5

bc14ab48b3cc300a8a2c14b9fe6b185a
SHA1

3fa377bf0f2cf8a5dab914eb0f224d2ca6b90c78
SHA256

e19ec4fa8dcc4d92b63bf6e5d4b9c519032799fec8fb7d5634adf34d954f067b
SHA512

5f34a257f7cb4511359708a243b15bedcac2d65911ecd4c168a97068c6f1aa77973bd9dffa9e496828883c067205865af159710d0d40e1d0317786fca421bf10
SSDEEP

49152:3vCI22SsaNYfdPBldt698dBcjHqpgzMvbRwLoGdcETHHB72eh2NT:3vP22SsaNYfdPBldt6+dBcjHqpgzMs

Score

10^/10

quasar rat discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Rat

C2

AMNSALKSamongus-47679.portmap.host:4782

Mutex

d3bc3858-ff4a-4aa8-97ec-67721ddcdeeb

Attributes

encryption_key
C8D618C9B5D2F91FFC94B6E9C868ECF80EB774F8
install_name
Client.exe
log_directory
ratted client
reconnect_delay
3000
startup_key
hello son
subdirectory
SubDir

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/2720-1-0x0000000000D40000-0x0000000001064000-memory.dmp	family_quasar
behavioral1/files/0x000700000001956c-5.dat	family_quasar
behavioral1/memory/2580-8-0x0000000000C00000-0x0000000000F24000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2580	Client.exe

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

System Information Discovery
T1082

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3020	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3020	PING.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
2944	schtasks.exe
2596	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2720	Bootstrapper.exe
Token: SeDebugPrivilege	2580	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2580	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2580	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2580	Client.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 2944	2720	Bootstrapper.exe	30
PID 2720 wrote to memory of 2944	2720	Bootstrapper.exe	30
PID 2720 wrote to memory of 2944	2720	Bootstrapper.exe	30
PID 2720 wrote to memory of 2580	2720	Bootstrapper.exe	32
PID 2720 wrote to memory of 2580	2720	Bootstrapper.exe	32
PID 2720 wrote to memory of 2580	2720	Bootstrapper.exe	32
PID 2580 wrote to memory of 2596	2580	Client.exe	33
PID 2580 wrote to memory of 2596	2580	Client.exe	33
PID 2580 wrote to memory of 2596	2580	Client.exe	33
PID 2580 wrote to memory of 2640	2580	Client.exe	35
PID 2580 wrote to memory of 2640	2580	Client.exe	35
PID 2580 wrote to memory of 2640	2580	Client.exe	35
PID 2640 wrote to memory of 3052	2640	cmd.exe	37
PID 2640 wrote to memory of 3052	2640	cmd.exe	37
PID 2640 wrote to memory of 3052	2640	cmd.exe	37
PID 2640 wrote to memory of 3020	2640	cmd.exe	38
PID 2640 wrote to memory of 3020	2640	cmd.exe	38
PID 2640 wrote to memory of 3020	2640	cmd.exe	38

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\Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "hello son " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2944
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2580
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "hello son " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2596
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\ybcBA6Kv60fD.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2640
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:3052
  - - C:\Windows\system32\PING.EXE
      ping -n 10 localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3020

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

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ybcBA6Kv60fD.bat

Filesize
207B

MD5
f91c2cb3c9d09a3319692d96ca5f8b60

SHA1
80de918026693c52f80a9d884eb16314055b45c0

SHA256
bd45368134542d9c1550966cf78eb7c3991e4c2284dc42284ee226e4b391b9a3

SHA512
dd00af06d08fe45bf4ff9b8c26b3d0b34e0f8b7fa1d773e27ce2052d1690e532b7e1c4a766592056303472bb156de4316dcb2afeaa62c136acda5f67147e1286

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
bc14ab48b3cc300a8a2c14b9fe6b185a

SHA1
3fa377bf0f2cf8a5dab914eb0f224d2ca6b90c78

SHA256
e19ec4fa8dcc4d92b63bf6e5d4b9c519032799fec8fb7d5634adf34d954f067b

SHA512
5f34a257f7cb4511359708a243b15bedcac2d65911ecd4c168a97068c6f1aa77973bd9dffa9e496828883c067205865af159710d0d40e1d0317786fca421bf10

Download Submit
memory/2580-7-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Filesize
9.9MB

Download
memory/2580-8-0x0000000000C00000-0x0000000000F24000-memory.dmp

Filesize
3.1MB

Download
memory/2580-10-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Filesize
9.9MB

Download
memory/2580-20-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Filesize
9.9MB

Download
memory/2720-0-0x000007FEF5D33000-0x000007FEF5D34000-memory.dmp

Filesize
4KB

Download
memory/2720-1-0x0000000000D40000-0x0000000001064000-memory.dmp

Filesize
3.1MB

Download
memory/2720-2-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Filesize
9.9MB

Download
memory/2720-9-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads