quasar | 09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708

General

Target

09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe
Size

3.1MB
MD5

0269fe5cdec427d07a9a4dcc515d52e0
SHA1

04352af5d4edbef348929641b407b1a87b984efe
SHA256

09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708
SHA512

c152a8d868dbbc23d0f0a06aacccec96b54139493cc6d74337499f69ac32e670f8f206a9a89d63ad2d667ab4c4b27b1b20ba77a246a15ee35320c0cd542ae458
SSDEEP

49152:3vyI22SsaNYfdPBldt698dBcjHAD6eCLogoGdGfTHHB72eh2NT8:3vf22SsaNYfdPBldt6+dBcjHAD63Wz

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

azxq0ap.localto.net:3425

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
install_name
Client.exe
log_directory
Logs
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4036-1-0x0000000000040000-0x0000000000364000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cbc-6.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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
5024	Client.exe

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

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "162"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.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
860	schtasks.exe
2664	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4036	09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe
Token: SeDebugPrivilege	5024	Client.exe
Token: SeShutdownPrivilege	4384	shutdown.exe
Token: SeRemoteShutdownPrivilege	4384	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5024	Client.exe
3148	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4036 wrote to memory of 860	4036	09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe	83
PID 4036 wrote to memory of 860	4036	09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe	83
PID 4036 wrote to memory of 5024	4036	09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe	85
PID 4036 wrote to memory of 5024	4036	09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe	85
PID 5024 wrote to memory of 2664	5024	Client.exe	86
PID 5024 wrote to memory of 2664	5024	Client.exe	86
PID 5024 wrote to memory of 4384	5024	Client.exe	105
PID 5024 wrote to memory of 4384	5024	Client.exe	105

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\09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe
"C:\Users\Admin\AppData\Local\Temp\09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4036
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:860
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5024
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2664
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4384

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa38c9855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3148

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
0269fe5cdec427d07a9a4dcc515d52e0

SHA1
04352af5d4edbef348929641b407b1a87b984efe

SHA256
09583e088d24ba1954129e650ceb81b5e38bf46f276ae20d1d0a056c1602d708

SHA512
c152a8d868dbbc23d0f0a06aacccec96b54139493cc6d74337499f69ac32e670f8f206a9a89d63ad2d667ab4c4b27b1b20ba77a246a15ee35320c0cd542ae458

Download Submit
memory/4036-10-0x00007FF9A4C40000-0x00007FF9A5701000-memory.dmp

Filesize
10.8MB

Download
memory/4036-1-0x0000000000040000-0x0000000000364000-memory.dmp

Filesize
3.1MB

Download
memory/4036-2-0x00007FF9A4C40000-0x00007FF9A5701000-memory.dmp

Filesize
10.8MB

Download
memory/4036-0-0x00007FF9A4C43000-0x00007FF9A4C45000-memory.dmp

Filesize
8KB

Download
memory/5024-11-0x00007FF9A4C40000-0x00007FF9A5701000-memory.dmp

Filesize
10.8MB

Download
memory/5024-9-0x00007FF9A4C40000-0x00007FF9A5701000-memory.dmp

Filesize
10.8MB

Download
memory/5024-12-0x000000001C390000-0x000000001C3E0000-memory.dmp

Filesize
320KB

Download
memory/5024-13-0x000000001C4A0000-0x000000001C552000-memory.dmp

Filesize
712KB

Download
memory/5024-16-0x000000001C430000-0x000000001C442000-memory.dmp

Filesize
72KB

Download
memory/5024-17-0x000000001CBA0000-0x000000001CBDC000-memory.dmp

Filesize
240KB

Download
memory/5024-18-0x00007FF9A4C40000-0x00007FF9A5701000-memory.dmp

Filesize
10.8MB

Download
memory/5024-20-0x00007FF9A4C40000-0x00007FF9A5701000-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