d5228a78b4dcc4d45d6d09323cd0731dcb8581169ee9722f54921c8e15dd891b

Analysis

user interaction
yes
max time kernel
117s
max time network
127s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
22/06/2026, 04:36

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Reason

Machine shutdown

General

Target
MasonClient.exe
Size 49KB
Sample260622-e8ckhshw6x
SHA256 d5228a78b4dcc4d45d6d09323cd0731dcb8581169ee9722f54921c8e15dd891b
MD5 7b60d7bd765421c51b980fffc856bbdc
SHA1 662fb40a6819e4ba9abe2da1c875139ffeb27926
SHA512 1501136072d8aa7235692244fe18d904a96f8fe9a4f24092794ff3b1a0bfcb17b5bbf747f6967dd59e929fc4306f72e2a073b4e78f60519dbf696d0642233891
SSDEEP 768:3ZIqKMI0Z25XDSkfU/AEQoD+kkObIDvGYtNphLOXg19mKI:3ZrKBL5XyPQtknbIDv91OK9mKI
TLSH
T12533F98DFBE25120C4BF4AF159B74348E2B17A976826C21E7DC841CA1727E859290EF3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

8^/10

bootkit defense_evasion discovery execution persistence

Malware Config

Signatures

Disables Task Manager via registry modification
defense_evasion

Executes dropped EXE 11 IoCs

pid	Process
4296	MasonClient.exe
220	MasonClient.exe
1892	MasonClient.exe
2208	tmpD97E.tmp.exe
2448	tmpDD09.tmp.exe
4540	MBR2.exe
3860	TROLL5.exe
1568	TROLL2.exe
4384	MatrixMBR.exe
348	GDI.exe
1836	MBR.exe

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	tmpDD09.tmp.exe
File opened for modification	\??\PhysicalDrive0	MBR.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\MatrixMBR.exe	MBR2.exe
File opened for modification	C:\Windows\System32\MatrixMBR.exe	MBR2.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 5 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	tmpDD09.tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TROLL5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TROLL2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GDI.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MBR.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
5008	schtasks.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	548	MasonClient.exe
Token: SeDebugPrivilege	4296	MasonClient.exe
Token: SeDebugPrivilege	220	MasonClient.exe
Token: SeDebugPrivilege	1892	MasonClient.exe
Token: 33	4068	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	4068	AUDIODG.EXE
Token: SeShutdownPrivilege	1836	MBR.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 548 wrote to memory of 5008	548	MasonClient.exe	81
PID 548 wrote to memory of 2208	548	MasonClient.exe	90
PID 548 wrote to memory of 2448	548	MasonClient.exe	91
PID 2208 wrote to memory of 4540	2208	tmpD97E.tmp.exe	93
PID 2208 wrote to memory of 3860	2208	tmpD97E.tmp.exe	94
PID 2208 wrote to memory of 1568	2208	tmpD97E.tmp.exe	95
PID 4540 wrote to memory of 4384	4540	MBR2.exe	96
PID 4384 wrote to memory of 348	4384	MatrixMBR.exe	97
PID 4384 wrote to memory of 1836	4384	MatrixMBR.exe	98

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\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:548
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5008
- C:\Users\Admin\AppData\Local\Temp\tmpD97E.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmpD97E.tmp.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:2208
- - C:\Users\Admin\AppData\Local\Temp\MBR2.exe
    "C:\Users\Admin\AppData\Local\Temp\MBR2.exe"
    3⤵
    - Executes dropped EXE
    - Drops file in System32 directory
    - Suspicious use of WriteProcessMemory
    PID:4540
  - - C:\Windows\System32\MatrixMBR.exe
      "C:\Windows\System32\MatrixMBR.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:4384
    - - C:\Users\Admin\AppData\Local\Temp\GDI.exe
        
        "C:\Users\Admin\AppData\Local\Temp\GDI.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        
        PID:348
    - - C:\Users\Admin\AppData\Local\Temp\MBR.exe
        
        "C:\Users\Admin\AppData\Local\Temp\MBR.exe"
        5⤵
        Executes dropped EXE
        Writes to the Master Boot Record (MBR)
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:1836
- - C:\Users\Admin\AppData\Local\Temp\TROLL5.exe
    "C:\Users\Admin\AppData\Local\Temp\TROLL5.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3860
- - C:\Users\Admin\AppData\Local\Temp\TROLL2.exe
    "C:\Users\Admin\AppData\Local\Temp\TROLL2.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1568
- C:\Users\Admin\AppData\Local\Temp\tmpDD09.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmpDD09.tmp.exe"
  2⤵
  - Executes dropped EXE
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  PID:2448

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4296

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:220

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1892

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x00000000000004C8 0x00000000000004C0
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4068

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

MasonClient.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClient.exe.log
Size 654B
SHA256 e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3
MD5 2cbbb74b7da1f720b48ed31085cbd5b8
SHA1 79caa9a3ea8abe1b9c4326c3633da64a5f724964
SHA512 ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9
TLSH
T119F0A2302371E1C8C9263F422C0D2A4966AF474A7B50FE0C7694635DD825167AF313F3
MD5 SHA1 SHA512 TLSH

Submit Download

GDI.exe

Path C:\Users\Admin\AppData\Local\Temp\GDI.exe
Size 11KB
SHA256 e153def894c867923dd56a7025b7b0b7bd3ee37c801a5957201d39f999bb28bf
MD5 c08ae6d9c6ecd7e13f827bf68767785f
SHA1 e71c2ec8d00c1e82b8b07baee0688b0a28604454
SHA512 c28bbe8abc66ad2433e5a3b93a4601b28225e86cb4bff077fd3224adfa63164bebfa3002a42b1cb4cb3c7ccad0208f8b143b8a17099bea04fcb964e667c7a1c0
SSDEEP 192:99qzCdTRiOurQItQ6YTkMfTiC96Tp80/Yc/75e:PXdTROQItQTTka2O6Tp3/Yc/g
TLSH
T1B432191197D08276ED320AB278A35742CB77EB57D967DABE348C912BBF732014293361
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

MBR.exe

Path C:\Users\Admin\AppData\Local\Temp\MBR.exe
Size 93KB
SHA256 acddde9514e3b9d5c40b3d1750af5f4187c99f8987b027d6da44fb6bcf79b3ca
MD5 d2fc66cf781a2497fceb4041a93cc676
SHA1 480b1aa31b0b31fc0e0833afbba06533ab9a90ee
SHA512 6c4cb42f786301be7614d4cb0b32601fea151351b0877e2371632435eb2c54bd4cd04d6b23bf4f49017ccaf679331162aac7329a1ed2409e3c2e02d0326e3487
SSDEEP 1536:CmwoXyoci5SjY3SaRO7IPqifrJxdhGZCJjmGasWhQcdQ5/hO2oFaLJ:Tv5MYRIMPqiTJx+ZqreRQ5/hXoM9
TLSH
T10A936C43B5D28CB2E5B21D311875CAA15A2FB9214E348E6B6794137E1F340D09E36FB7
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

MBR2.exe

Path C:\Users\Admin\AppData\Local\Temp\MBR2.exe
Size 205KB
SHA256 c22e2419f04fe03a92255a139ca8814697962e86d191a1d4171788fd0c903f68
MD5 3dc0e225f886bae3b655cd9d738ed32f
SHA1 abda127fd477bd9d051cd57b16ac13f44030a9ae
SHA512 c8a6c0bfa96defde6f83d847583ff2ec065a43f80f9886259a2d1fe7df306ef6ed7aeed61b7dcf0bdc111fc67419eb66cf1ca44e831711dd4ea7d25ed9aed09b
SSDEEP 3072:VQKrqi3qqKcjzksuicc/9Ic9hwBjQV8xWegUqijR4uTkEJxIiLt2p/YkMhapu4n4:Vruc/iuwBMV8x5gUqMR4aMiLcpj84
TLSH
T1D92423001754132EFB59C0F6019712B381EBD3AE9E1B9489F3F9921BDB6B10ED91747A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

TROLL2.exe

Path C:\Users\Admin\AppData\Local\Temp\TROLL2.exe
Size 105KB
SHA256 dcdf5140bc51db27f3aec80ae9a66a57aad446a2522904d288770e8d8cde8cee
MD5 52a2a5517deb1a06896891a35299ce20
SHA1 badcbdfef312bd71de997a7416ee20cee5d66af6
SHA512 7cb0de412c0508f5af522aeaf3731dda418f72f7cae8dd3f21b34d5cdbc08f9dea8699d59878610496c68d687227a0269739221490d70d03b8e4b84dfd29d5f1
SSDEEP 1536:A85iT6EcrYTyyAmOvu3yUyJCbT4UK7BIR:IGEcxyAF64A
TLSH
T1D6B3F6D7BE8AADA3F925133989F98319033DF7C01B828B171D31993A17176A17FC5246
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

TROLL5.exe

Path C:\Users\Admin\AppData\Local\Temp\TROLL5.exe
Size 712KB
SHA256 79f00c7dab0891824136539fabd542c74e26cbed94b9add3f1aa7f793d653de6
MD5 542a4e400ff233b21a1a3c27751ac783
SHA1 000a67f00b0003531d65a6ed6f16488ae5dcd0fe
SHA512 8335118ca0c268635d9495b331fb65800a32a0631f132cd34ce84ca3b523d0a9e23eee6d76539d0c81d86fda534da56c936914012d8bad35040b15cc8caaf645
SSDEEP 12288:cF04yK+m1Vd5IfbJQWYzBVXqKWOF+LmguP/WMYZCubHKG91MiYwd:Z4yedWfEHnWbLunWMYUaHzLY2
TLSH
T1BDF423738484A51CD6EFCE33A0F1FC3463BAFE2761198C112294EDD46AA715097CBB65
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tmp15EC.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp15EC.tmp
Size 109KB
SHA256 fe74cb06318fd7451fed5ad5ce5605bb746bb5ef55da3fe96f52ba20e159db49
MD5 7ccccd0ddf864a061e175cf9e5114a46
SHA1 c0b798cd725d5f270f347790e2ad13dab60108e3
SHA512 8ad1bb6375e7f35e0dc41353d2e79499285cc401c412ea16fdbb123c3a53aef315186f594364a4f4156a58fa780c973bbc7e0202e6a1ed8380742b6c45058132
SSDEEP 192:jDWSMSBDWSMSBDWSMSBDWSMSBDWSMSBDWSMSBDWSMn:jDTDTDTDTDTDTDS
TLSH
T1A9B3C0678051249C540E892283FA1DB66CAB2FB07A7CF549AE37BCB553B32D36053E17
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tmpD97E.tmp.exe

Path C:\Users\Admin\AppData\Local\Temp\tmpD97E.tmp.exe
Size 921KB
SHA256 deaf30953149d0bef45a11bd89f4ef69f77115e50380c7ef3607c37ff4f40a1d
MD5 03c3e9290329eec39c6543006f9ac9f1
SHA1 78e676fc850fb5d4e1c75b813f15b841fdf7705d
SHA512 b2c5b1b060a0349bc92cc5a8b286f149b5cf6b40264e7b613b76c911e4acc6352ed0fdd9d945fae9c025963cae02f3f2cbef8a62bff844764a66481119c6321d
SSDEEP 24576:QCFZOZHLhrN+f4SULfWyBPzB8JAk4cQATg:1F+LL+fIWybB8
TLSH
T13B15239832772A1FCCE72737E5E739A463AE323D0937229D04A5F37D1E415C05726AA2
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tmpDD09.tmp.exe

Path C:\Users\Admin\AppData\Local\Temp\tmpDD09.tmp.exe
Size 161KB
SHA256 fc18ac689568aea34f287e1ff20bfee7cfec3f3f626aab3d2c23a180969ae0a6
MD5 2672a80cf701037e262f1bb55c5202b5
SHA1 fe35a751182023ea77e876a327d5e47f1e02885b
SHA512 e1356770d6e23795170d855ae8cecfa29521a0dee86993e45c875f6cde2f0682d79a56d5ba6ad5b88817e886e21485e5755960a80bafd59d2bdd175ce845237a
SSDEEP 3072:QiG22Q1qS2U6A5nHpIT999Vyai8AXUtmDGZLCLCZnuY02eI0/90jkrTxrWqY:QojqSd6A5n6n9TCX+CugC50tz/90jkrV
TLSH
T185F3024956B96453D7F5C2732CFF7E004364A66F9B169BDF388CD86A6F16384221330A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

MasonClient.exe

Path C:\Users\Admin\AppData\Roaming\MasonClient.exe
Size 49KB
SHA256 d5228a78b4dcc4d45d6d09323cd0731dcb8581169ee9722f54921c8e15dd891b
MD5 7b60d7bd765421c51b980fffc856bbdc
SHA1 662fb40a6819e4ba9abe2da1c875139ffeb27926
SHA512 1501136072d8aa7235692244fe18d904a96f8fe9a4f24092794ff3b1a0bfcb17b5bbf747f6967dd59e929fc4306f72e2a073b4e78f60519dbf696d0642233891
SSDEEP 768:3ZIqKMI0Z25XDSkfU/AEQoD+kkObIDvGYtNphLOXg19mKI:3ZrKBL5XyPQtknbIDv91OK9mKI
TLSH
T12533F98DFBE25120C4BF4AF159B74348E2B17A976826C21E7DC841CA1727E859290EF3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

MatrixMBR.exe

Path C:\Windows\System32\MatrixMBR.exe
Size 250KB
SHA256 339fe94164952a8454e6ec5fc75e2c38baade2c14b231e47bf41989ffbb55ee4
MD5 24c441662c09b94e14a4096a8e59c316
SHA1 11576cad137bd8ed76efecd711c0390fe5c85292
SHA512 7f6ca1366733c5fb4925001c0846510732031a9e5f1b16291ff596187c20a88f41193389cedcb73e3928c318fc972be4f03e3cb71f1487c34642897ff9a2b590
SSDEEP 6144:XGaiVa9WL/GgkszuMO1yV8xTgUqMRQaMiBcxj8:Waisszux1yGRLHBo
TLSH
T1FD4402053F44A465D3689BB08AF3E2A782B8FD396C02D95BFD84775F2E37D0E9801265
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/348-116-0x0000000000820000-0x0000000000828000-memory.dmp

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memory/548-2-0x0000000000E00000-0x0000000000E10000-memory.dmp

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memory/548-6-0x0000000000E00000-0x0000000000E10000-memory.dmp

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memory/548-0-0x00000000005D0000-0x00000000005E2000-memory.dmp

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memory/548-9-0x0000000000CA0000-0x0000000000D2E000-memory.dmp

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memory/1568-87-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2208-22-0x0000000000030000-0x000000000011C000-memory.dmp

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memory/2208-23-0x000000001C350000-0x000000001C434000-memory.dmp

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memory/2448-39-0x0000000006D40000-0x0000000006DD2000-memory.dmp

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memory/2448-35-0x0000000000D10000-0x0000000000D3E000-memory.dmp

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memory/3860-77-0x00000000050D0000-0x00000000050DA000-memory.dmp

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memory/3860-76-0x00000000056D0000-0x0000000005C76000-memory.dmp

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memory/3860-75-0x0000000000600000-0x00000000006B8000-memory.dmp

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memory/4384-92-0x0000000000730000-0x0000000000776000-memory.dmp

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memory/4540-54-0x0000000000400000-0x000000000043A000-memory.dmp

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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