quasar | 719a7b316bfd202755b62a1a832ec1ef53a731dfa7e046d0cc92a797e414450f

General

Target

$77-Client.exe
Size

3.1MB
MD5

acc9e9d547efe13b2b0be13cb14aa721
SHA1

0a859b612ab726e7de353fe25ea862b38d23401f
SHA256

719a7b316bfd202755b62a1a832ec1ef53a731dfa7e046d0cc92a797e414450f
SHA512

e2225f526057068e6eb2c284c9e4429fd819923e52f9f8275a743feb5bb9c8519287cd3ce698761b717df6e3c870b21ff2a1eb2a61e29438d3d6f55e14588084
SSDEEP

49152:2vBt62XlaSFNWPjljiFa2RoUYI8ZCq1J0LoGd+1THHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIiCn

Score

10^/10

quasar slave discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Slave

C2

147.185.221.20:49485

Mutex

725e8cd4-7df0-4c5f-8cad-7f42a47ec93d

Attributes

encryption_key
8A741B205625DDE1631E142A4F37B4EFE8EC3980
install_name
$77-Client.exe
log_directory
$77-Logs
reconnect_delay
3000
startup_key
$77-Client
subdirectory
$77-SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral3/memory/4792-1-0x00000000003E0000-0x0000000000704000-memory.dmp	family_quasar
behavioral3/files/0x000300000002aa55-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4360	$77-Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\$77-SubDir	$77-Client.exe
File opened for modification	C:\Windows\system32\$77-SubDir\$77-Client.exe	$77-Client.exe
File opened for modification	C:\Windows\system32\$77-SubDir	$77-Client.exe
File created	C:\Windows\system32\$77-SubDir\$77-Client.exe	$77-Client.exe
File opened for modification	C:\Windows\system32\$77-SubDir\$77-Client.exe	$77-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
2412	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2412	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
4976	schtasks.exe
4748	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4792	$77-Client.exe
Token: SeDebugPrivilege	4360	$77-Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4360	$77-Client.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4792 wrote to memory of 4976	4792	$77-Client.exe	81
PID 4792 wrote to memory of 4976	4792	$77-Client.exe	81
PID 4792 wrote to memory of 4360	4792	$77-Client.exe	83
PID 4792 wrote to memory of 4360	4792	$77-Client.exe	83
PID 4360 wrote to memory of 4748	4360	$77-Client.exe	84
PID 4360 wrote to memory of 4748	4360	$77-Client.exe	84
PID 4360 wrote to memory of 1576	4360	$77-Client.exe	99
PID 4360 wrote to memory of 1576	4360	$77-Client.exe	99
PID 4360 wrote to memory of 1900	4360	$77-Client.exe	101
PID 4360 wrote to memory of 1900	4360	$77-Client.exe	101
PID 1900 wrote to memory of 3132	1900	cmd.exe	103
PID 1900 wrote to memory of 3132	1900	cmd.exe	103
PID 1900 wrote to memory of 2412	1900	cmd.exe	104
PID 1900 wrote to memory of 2412	1900	cmd.exe	104

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\$77-Client.exe
"C:\Users\Admin\AppData\Local\Temp\$77-Client.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4792
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "$77-Client" /sc ONLOGON /tr "C:\Windows\system32\$77-SubDir\$77-Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4976
- C:\Windows\system32\$77-SubDir\$77-Client.exe
  "C:\Windows\system32\$77-SubDir\$77-Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4360
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "$77-Client" /sc ONLOGON /tr "C:\Windows\system32\$77-SubDir\$77-Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4748
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /delete /tn "$77-Client" /f
    3⤵
    PID:1576
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\3jh2KoXIwRrR.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1900
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:3132
  - - C:\Windows\system32\PING.EXE
      ping -n 10 localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2412

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\Microsoft\CLR_v4.0\UsageLogs\$77-Client.exe.log

Filesize
1KB

MD5
b4e91d2e5f40d5e2586a86cf3bb4df24

SHA1
31920b3a41aa4400d4a0230a7622848789b38672

SHA256
5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

SHA512
968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

Download Submit
C:\Users\Admin\AppData\Local\Temp\3jh2KoXIwRrR.bat

Filesize
208B

MD5
5f8e9d7ec53a595bdc98b78c1abbd0f5

SHA1
a620ef709271d86b04db3ad8692c3a6009f5750b

SHA256
cdb56bdb8c17b167371a4fe4c2b3eedd8e9f750b919950a89c7a19bafc9716c9

SHA512
250ae3b4f9a6c298570d18fd867c4c416e78f8a0f5c5938a48018c58c07cf5b56b679e2640e66bd7dcc874f1d422bf385e1b26b0afa5fc30615602d7b1310132

Download Submit
C:\Windows\System32\$77-SubDir\$77-Client.exe

Filesize
3.1MB

MD5
acc9e9d547efe13b2b0be13cb14aa721

SHA1
0a859b612ab726e7de353fe25ea862b38d23401f

SHA256
719a7b316bfd202755b62a1a832ec1ef53a731dfa7e046d0cc92a797e414450f

SHA512
e2225f526057068e6eb2c284c9e4429fd819923e52f9f8275a743feb5bb9c8519287cd3ce698761b717df6e3c870b21ff2a1eb2a61e29438d3d6f55e14588084

Download Submit
memory/4360-11-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4360-12-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4360-13-0x000000001C100000-0x000000001C150000-memory.dmp

Filesize
320KB

Download
memory/4360-14-0x000000001C210000-0x000000001C2C2000-memory.dmp

Filesize
712KB

Download
memory/4360-17-0x000000001C1B0000-0x000000001C1C2000-memory.dmp

Filesize
72KB

Download
memory/4360-18-0x000000001CD20000-0x000000001CD5C000-memory.dmp

Filesize
240KB

Download
memory/4360-19-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4360-24-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4792-10-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4792-2-0x00007FFCD6030000-0x00007FFCD6AF2000-memory.dmp

Filesize
10.8MB

Download
memory/4792-0-0x00007FFCD6033000-0x00007FFCD6035000-memory.dmp

Filesize
8KB

Download
memory/4792-1-0x00000000003E0000-0x0000000000704000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads