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 2 IoCs

resource	yara_rule
behavioral2/memory/4152-1-0x0000000000490000-0x00000000004DE000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c83-11.dat	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 3 IoCs

pid	Process
996	Client.exe
4720	Client.exe
1416	Client.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-1-5-21-2437139445-1151884604-3026847218-1000\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
4	ip-api.com

Drops file in System32 directory 4 IoCs

description	ioc	Process
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
File created	C:\Windows\SysWOW64\SubDir\Client.exe	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client.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
1940	schtasks.exe
3852	schtasks.exe
3372	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
Token: SeDebugPrivilege	996	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
996	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4152 wrote to memory of 1940	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	84
PID 4152 wrote to memory of 1940	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	84
PID 4152 wrote to memory of 1940	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	84
PID 4152 wrote to memory of 996	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	86
PID 4152 wrote to memory of 996	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	86
PID 4152 wrote to memory of 996	4152	7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe	86
PID 996 wrote to memory of 3852	996	Client.exe	87
PID 996 wrote to memory of 3852	996	Client.exe	87
PID 996 wrote to memory of 3852	996	Client.exe	87
PID 996 wrote to memory of 3372	996	Client.exe	89
PID 996 wrote to memory of 3372	996	Client.exe	89
PID 996 wrote to memory of 3372	996	Client.exe	89

C:\Users\Admin\AppData\Local\Temp\7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe
"C:\Users\Admin\AppData\Local\Temp\7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f.exe"
1⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4152
- 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:1940
- C:\Windows\SysWOW64\SubDir\Client.exe
  "C:\Windows\SysWOW64\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - 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:996
- - 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:3852
- - 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:3372

C:\Windows\SysWOW64\SubDir\Client.exe
C:\Windows\SysWOW64\SubDir\Client.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:4720

C:\Windows\SysWOW64\SubDir\Client.exe
C:\Windows\SysWOW64\SubDir\Client.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:1416

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Client.exe.log

Filesize
701B

MD5
5de8527438c860bfa3140dc420a03e52

SHA1
235af682986b3292f20d8d71a8671353f5d6e16d

SHA256
d9d92cd6e7a4507912965138b8d1eabb3f188f4dfcb61115ee99dc2c0fd43a92

SHA512
77c3a774a2235c55ad520f1bf0c71fa3d3f0e7cf478a78e0d4dd6d253ee12a9859acc9ee822664467387788a2655a18373c8fcf08ea0d001549d3d4391b00bf8

Download Submit
C:\Windows\SysWOW64\SubDir\Client.exe

Filesize
288KB

MD5
80738ce6e30247c37ee36568c43c8a5f

SHA1
23e857927a17559cff000d3cde52d2fdf4b99cc9

SHA256
7e3c88b63ad3aa607cc07c79c05075eec2832c9a4ccb03e0005620759081f31f

SHA512
ea2a6a84ac11eb7631fb04c8fb6c30aa3aa3238dae674bfee5e859296a0f3f25e0ef9d44ee7b3550c9cae44323363e16d882d5be1b305e19408e0a2d05b24c48

Download Submit
memory/996-18-0x0000000006CE0000-0x0000000006CEA000-memory.dmp

Filesize
40KB

Download
memory/996-14-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/996-20-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/996-19-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/996-16-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/4152-6-0x0000000005BF0000-0x0000000005C02000-memory.dmp

Filesize
72KB

Download
memory/4152-2-0x00000000053E0000-0x0000000005984000-memory.dmp

Filesize
5.6MB

Download
memory/4152-7-0x0000000006130000-0x000000000616C000-memory.dmp

Filesize
240KB

Download
memory/4152-15-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/4152-3-0x0000000004F30000-0x0000000004FC2000-memory.dmp

Filesize
584KB

Download
memory/4152-0-0x000000007540E000-0x000000007540F000-memory.dmp

Filesize
4KB

Download
memory/4152-5-0x0000000004FD0000-0x0000000005036000-memory.dmp

Filesize
408KB

Download
memory/4152-4-0x0000000075400000-0x0000000075BB0000-memory.dmp

Filesize
7.7MB

Download
memory/4152-1-0x0000000000490000-0x00000000004DE000-memory.dmp

Filesize
312KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads