quasar | fbe5f5d43d9c6631ff75557f9eec341c15b58cac301de3b573bc1913a4daa3e0

General

Target

Client-built-stub-fub.exe
Size

3.2MB
MD5

9f12e3815f269826203a1baae1761698
SHA1

a6f1047279952df4f0c4b0f15fbef84d2a8ef2f5
SHA256

fbe5f5d43d9c6631ff75557f9eec341c15b58cac301de3b573bc1913a4daa3e0
SHA512

1c086a83fa969bacadef854eaddc6ad72f51abb1536a27af5c89604df3cc9641765cbd4d5bb6144956b07d0a8fd8fd3318665e6185b69d80235fdbc92d0f960d
SSDEEP

49152:St+NHEEtT54YyDAP4m2w99yvHT+8sVEDjP+IMh2d8KdZOQra3txClJHgo4jL4/jL:cbEt9HnEo9U+KjPe0d/dcTHmtx4j6jL

Score

10^/10

quasar default spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Default

C2

dksj.wi-fi.rip:4782

Mutex

f62fc232-4c6c-47fc-9704-2111bc364f22

Attributes

encryption_key
E883FEA800A47B3B853A04DDCD0D162E782B41B7
install_name
Client.exe
log_directory
fdgdg
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 6 IoCs

resource	yara_rule
behavioral1/memory/324-7-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral1/memory/324-8-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral1/memory/324-10-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral1/memory/324-12-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral1/memory/324-16-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar
behavioral1/memory/324-19-0x0000000000690000-0x00000000009B4000-memory.dmp	family_quasar

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3048 set thread context of 324	3048	Client-built-stub-fub.exe	28

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2804	schtasks.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3048	Client-built-stub-fub.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	324	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
324	vbc.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 324	3048	Client-built-stub-fub.exe	28
PID 3048 wrote to memory of 2392	3048	Client-built-stub-fub.exe	29
PID 3048 wrote to memory of 2392	3048	Client-built-stub-fub.exe	29
PID 3048 wrote to memory of 2392	3048	Client-built-stub-fub.exe	29
PID 3048 wrote to memory of 2392	3048	Client-built-stub-fub.exe	29
PID 3048 wrote to memory of 1720	3048	Client-built-stub-fub.exe	31
PID 3048 wrote to memory of 1720	3048	Client-built-stub-fub.exe	31
PID 3048 wrote to memory of 1720	3048	Client-built-stub-fub.exe	31
PID 3048 wrote to memory of 1720	3048	Client-built-stub-fub.exe	31
PID 3048 wrote to memory of 1728	3048	Client-built-stub-fub.exe	32
PID 3048 wrote to memory of 1728	3048	Client-built-stub-fub.exe	32
PID 3048 wrote to memory of 1728	3048	Client-built-stub-fub.exe	32
PID 3048 wrote to memory of 1728	3048	Client-built-stub-fub.exe	32
PID 1720 wrote to memory of 2804	1720	cmd.exe	35
PID 1720 wrote to memory of 2804	1720	cmd.exe	35
PID 1720 wrote to memory of 2804	1720	cmd.exe	35
PID 1720 wrote to memory of 2804	1720	cmd.exe	35

C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:3048
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:324
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c mkdir "C:\Users\Admin\AppData\Roaming\ereregd"
  2⤵
  PID:2392
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe'" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1720
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:2804
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c copy "C:\Users\Admin\AppData\Local\Temp\Client-built-stub-fub.exe" "C:\Users\Admin\AppData\Roaming\ereregd\ereregd.exe"
  2⤵
  PID:1728

C:\Windows\system32\taskeng.exe
taskeng.exe {27E764BD-BF03-4ED8-B8F5-62F7C3340196} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
1⤵
PID:2908

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scripting

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/324-10-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-12-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-23-0x0000000073F60000-0x000000007464E000-memory.dmp

Filesize
6.9MB

Download
memory/324-3-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-5-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-7-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-22-0x0000000004A50000-0x0000000004A90000-memory.dmp

Filesize
256KB

Download
memory/324-8-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-20-0x0000000073F60000-0x000000007464E000-memory.dmp

Filesize
6.9MB

Download
memory/324-9-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/324-16-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/324-19-0x0000000000690000-0x00000000009B4000-memory.dmp

Filesize
3.1MB

Download
memory/3048-1-0x0000000073F60000-0x000000007464E000-memory.dmp

Filesize
6.9MB

Download
memory/3048-21-0x0000000073F60000-0x000000007464E000-memory.dmp

Filesize
6.9MB

Download
memory/3048-0-0x0000000000370000-0x000000000069E000-memory.dmp

Filesize
3.2MB

Download
memory/3048-2-0x0000000004550000-0x0000000004590000-memory.dmp

Filesize
256KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads