quasar | 7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f

General

Target

7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
Size

288KB
MD5

80738ce6e30247c37ee36568c43c8a5f
SHA1

23e857927a17559cff000d3cde52d2fdf4b99cc9
SHA256

7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f
SHA512

ea2a6a84ac11eb7631fb04c8fb6c30aa3aa3238dae674bfee5e859296a0f3f25e0ef9d44ee7b3550c9cae44323363e16d882d5be1b305e19408e0a2d05b24c48
SSDEEP

6144:k7zO0LSclT6FOwEP5Kq+SMv0VGb7bDcllbkvn:alJtTF9zVGkllbk/

Score

10^/10

quasar office04 discovery persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office04

C2

hiyashi-64129.portmap.io:64129

Mutex

PjIwWrgtTiUxldOLKM

Attributes

encryption_key
NN6uwWE7m1kB5ep5QSu8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svhost
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/1236-1-0x0000000000B90000-0x0000000000BDE000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016311-5.dat	family_quasar
behavioral1/memory/2076-10-0x00000000008D0000-0x000000000091E000-memory.dmp	family_quasar

Executes dropped EXE 3 IoCs

pid	Process
2076	Client.exe
2624	Client.exe
2124	Client.exe

Loads dropped DLL 1 IoCs

pid	Process
1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\svhost = "\"C:\\Windows\\SysWOW64\\SubDir\\Client.exe\""	Client.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	ip-api.com

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\SubDir\Client.exe	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\Client.exe	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\SysWOW64\SubDir	Client.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2808	schtasks.exe
2700	schtasks.exe
1708	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
Token: SeDebugPrivilege	2076	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2076	Client.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 1708	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	31
PID 1236 wrote to memory of 1708	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	31
PID 1236 wrote to memory of 1708	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	31
PID 1236 wrote to memory of 1708	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	31
PID 1236 wrote to memory of 2076	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	33
PID 1236 wrote to memory of 2076	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	33
PID 1236 wrote to memory of 2076	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	33
PID 1236 wrote to memory of 2076	1236	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	33
PID 2076 wrote to memory of 2808	2076	Client.exe	35
PID 2076 wrote to memory of 2808	2076	Client.exe	35
PID 2076 wrote to memory of 2808	2076	Client.exe	35
PID 2076 wrote to memory of 2808	2076	Client.exe	35
PID 2076 wrote to memory of 2700	2076	Client.exe	37
PID 2076 wrote to memory of 2700	2076	Client.exe	37
PID 2076 wrote to memory of 2700	2076	Client.exe	37
PID 2076 wrote to memory of 2700	2076	Client.exe	37
PID 2652 wrote to memory of 2624	2652	taskeng.exe	40
PID 2652 wrote to memory of 2624	2652	taskeng.exe	40
PID 2652 wrote to memory of 2624	2652	taskeng.exe	40
PID 2652 wrote to memory of 2624	2652	taskeng.exe	40
PID 2652 wrote to memory of 2124	2652	taskeng.exe	41
PID 2652 wrote to memory of 2124	2652	taskeng.exe	41
PID 2652 wrote to memory of 2124	2652	taskeng.exe	41
PID 2652 wrote to memory of 2124	2652	taskeng.exe	41

C:\Users\Admin\AppData\Local\Temp\7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
"C:\Users\Admin\AppData\Local\Temp\7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1236
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:1708
- C:\Windows\SysWOW64\SubDir\Client.exe
  "C:\Windows\SysWOW64\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2076
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Windows\SysWOW64\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2808
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Windows\SysWOW64\SubDir\Client.exe" /sc MINUTE /MO 1
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2700

C:\Windows\system32\taskeng.exe
taskeng.exe {789329B3-9431-45D8-961B-29B2DB7803E8} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2652
- C:\Windows\SysWOW64\SubDir\Client.exe
  C:\Windows\SysWOW64\SubDir\Client.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2624
- C:\Windows\SysWOW64\SubDir\Client.exe
  C:\Windows\SysWOW64\SubDir\Client.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2124

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

\Windows\SysWOW64\SubDir\Client.exe

Filesize
288KB

MD5
80738ce6e30247c37ee36568c43c8a5f

SHA1
23e857927a17559cff000d3cde52d2fdf4b99cc9

SHA256
7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f

SHA512
ea2a6a84ac11eb7631fb04c8fb6c30aa3aa3238dae674bfee5e859296a0f3f25e0ef9d44ee7b3550c9cae44323363e16d882d5be1b305e19408e0a2d05b24c48

Download Submit
memory/1236-0-0x0000000074ACE000-0x0000000074ACF000-memory.dmp

Filesize
4KB

Download
memory/1236-1-0x0000000000B90000-0x0000000000BDE000-memory.dmp

Filesize
312KB

Download
memory/1236-2-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download
memory/1236-13-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download
memory/2076-12-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download
memory/2076-11-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download
memory/2076-10-0x00000000008D0000-0x000000000091E000-memory.dmp

Filesize
312KB

Download
memory/2076-15-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download
memory/2076-16-0x0000000074AC0000-0x00000000751AE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads