quasar | ab7f57812dcc2c9ddd51aa06afdbc083d6f42dc8a4d1a9f2ab91bcee9722fef3

General

Target

CandyDDoser-installerx32.exe
Size

3.1MB
MD5

b020b1f73c110300f25ae110b3dd59df
SHA1

8bfa300b77c9c3e302001311d88568d816c590ae
SHA256

ab7f57812dcc2c9ddd51aa06afdbc083d6f42dc8a4d1a9f2ab91bcee9722fef3
SHA512

98047f3bab00b4c4d6a3a23c0d31c7940328a8d6d1cfed1173ead3b094fc95ba18f57729a75045f9d5c7a8e5c1e9496f12617efc7a370a75e6c87b25455b9339
SSDEEP

49152:/v7I22SsaNYfdPBldt698dBcjHQ0lRJ61bR3LoGdL1THHB72eh2NTz:/vE22SsaNYfdPBldt6+dBcjHQ0lRJ6H

Score

10^/10

quasar candyddoser-installer spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

CandyDDoser-Installer

C2

127.0.0.1:5656

Mutex

a4451484-07b3-4077-bce4-aad7f3859a48

Attributes

encryption_key
0BF10FE69CA9AD8F67C8185E9EEB25C381EB6210
install_name
system32remove.exe
log_directory
Logs
reconnect_delay
10
startup_key
system32
subdirectory
Windows

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/memory/4468-1-0x0000000000D20000-0x0000000001048000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cac-8.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3796	system32remove.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\Windows\system32remove.exe	CandyDDoser-installerx32.exe
File opened for modification	C:\Windows\system32\Windows	CandyDDoser-installerx32.exe
File opened for modification	C:\Windows\system32\Windows\system32remove.exe	system32remove.exe
File opened for modification	C:\Windows\system32\Windows	system32remove.exe
File created	C:\Windows\system32\Windows\system32remove.exe	CandyDDoser-installerx32.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
1056	schtasks.exe
4044	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4468	CandyDDoser-installerx32.exe
Token: SeDebugPrivilege	3796	system32remove.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3796	system32remove.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3796	system32remove.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3796	system32remove.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4468 wrote to memory of 1056	4468	CandyDDoser-installerx32.exe	83
PID 4468 wrote to memory of 1056	4468	CandyDDoser-installerx32.exe	83
PID 4468 wrote to memory of 3796	4468	CandyDDoser-installerx32.exe	85
PID 4468 wrote to memory of 3796	4468	CandyDDoser-installerx32.exe	85
PID 3796 wrote to memory of 4044	3796	system32remove.exe	86
PID 3796 wrote to memory of 4044	3796	system32remove.exe	86

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\CandyDDoser-installerx32.exe
"C:\Users\Admin\AppData\Local\Temp\CandyDDoser-installerx32.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4468
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "system32" /sc ONLOGON /tr "C:\Windows\system32\Windows\system32remove.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1056
- C:\Windows\system32\Windows\system32remove.exe
  "C:\Windows\system32\Windows\system32remove.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3796
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "system32" /sc ONLOGON /tr "C:\Windows\system32\Windows\system32remove.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4044

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\system32\Windows\system32remove.exe

Filesize
3.1MB

MD5
b020b1f73c110300f25ae110b3dd59df

SHA1
8bfa300b77c9c3e302001311d88568d816c590ae

SHA256
ab7f57812dcc2c9ddd51aa06afdbc083d6f42dc8a4d1a9f2ab91bcee9722fef3

SHA512
98047f3bab00b4c4d6a3a23c0d31c7940328a8d6d1cfed1173ead3b094fc95ba18f57729a75045f9d5c7a8e5c1e9496f12617efc7a370a75e6c87b25455b9339

Download Submit
memory/3796-9-0x00007FFC50C40000-0x00007FFC51701000-memory.dmp

Filesize
10.8MB

Download
memory/3796-11-0x00007FFC50C40000-0x00007FFC51701000-memory.dmp

Filesize
10.8MB

Download
memory/3796-12-0x000000001BD30000-0x000000001BD80000-memory.dmp

Filesize
320KB

Download
memory/3796-13-0x000000001BE40000-0x000000001BEF2000-memory.dmp

Filesize
712KB

Download
memory/3796-14-0x00007FFC50C40000-0x00007FFC51701000-memory.dmp

Filesize
10.8MB

Download
memory/4468-0-0x00007FFC50C43000-0x00007FFC50C45000-memory.dmp

Filesize
8KB

Download
memory/4468-1-0x0000000000D20000-0x0000000001048000-memory.dmp

Filesize
3.2MB

Download
memory/4468-2-0x00007FFC50C40000-0x00007FFC51701000-memory.dmp

Filesize
10.8MB

Download
memory/4468-10-0x00007FFC50C40000-0x00007FFC51701000-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