43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

General

Target

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
Size

305KB
MD5

1a1733bae2a5c22dc130d2f0f82302ef
SHA1

5334d5f2c4d14c214ce4e86fe3f5098b7f38d008
SHA256

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987
SHA512

0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30
SSDEEP

6144:XNFawti8qjlBtYCcYWctAnvLxSRO3NO4n06qAOssKfpYT:doQiDpBuCcB9WO3U40hAOssMps

Score

10^/10

agilenet persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

WindowsUpdatechecker.execsrss.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Users\\Admin\\AppData\\Roaming\\WindowsUpdatechecker.exe"	WindowsUpdatechecker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Users\\Admin\\AppData\\Roaming\\WindowsUpdatechecker.exe"	WindowsUpdatechecker.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Users\\Admin\\AppData\\Roaming\\WindowsUpdatechecker.exe"	csrss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, C:\\Users\\Admin\\AppData\\Roaming\\WindowsUpdatechecker.exe"	csrss.exe

Executes dropped EXE 1 IoCs

Processes:

csrss.exe

pid process

1888 csrss.exe
Loads dropped DLL 5 IoCs

Processes:

WindowsUpdatechecker.execsrss.exe

pid process

1584 WindowsUpdatechecker.exe
1584 WindowsUpdatechecker.exe
1888 csrss.exe
1888 csrss.exe
1888 csrss.exe

pid	process
1888	csrss.exe

pid	process
1584	WindowsUpdatechecker.exe
1584	WindowsUpdatechecker.exe
1888	csrss.exe
1888	csrss.exe
1888	csrss.exe

Obfuscated with Agile.Net obfuscator 7 IoCs

Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

agilenet

Processes:

resource	yara_rule
\Users\Admin\AppData\Roaming\csrss.exe	agile_net
\Users\Admin\AppData\Roaming\csrss.exe	agile_net
C:\Users\Admin\AppData\Roaming\csrss.exe	agile_net
\Users\Admin\AppData\Roaming\csrss.exe	agile_net
\Users\Admin\AppData\Roaming\csrss.exe	agile_net
\Users\Admin\AppData\Roaming\csrss.exe	agile_net
C:\Users\Admin\AppData\Roaming\csrss.exe	agile_net

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

csrss.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	csrss.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\windws = "\"C:\\Windows\\SysWOW64\\svchost.exe\""	csrss.exe

Checks for any installed AV software in registry 1 TTPs 2 IoCs

Security Software Discovery

T1063

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Avira	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\avast! Antivirus	svchost.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

Processes:

csrss.exe

pid process

1888 csrss.exe
1888 csrss.exe
1888 csrss.exe
1888 csrss.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

WindowsUpdatechecker.exe

description pid process target process

PID 1584 set thread context of 1516 1584 WindowsUpdatechecker.exe svchost.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1888	csrss.exe
1888	csrss.exe
1888	csrss.exe
1888	csrss.exe

description	pid	process	target process
PID 1584 set thread context of 1516	1584	WindowsUpdatechecker.exe	svchost.exe

Checks processor information in registry 2 TTPs 7 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.execsrss.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\2	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	svchost.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\1	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\2	csrss.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	svchost.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\1	svchost.exe

Modifies registry class 3 IoCs

Processes:

csrss.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\CLSID\{22788406-694E-E14F-9635-57A764C20F26}\5EE8079D\CS1	csrss.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\CLSID\{22788406-694E-E14F-9635-57A764C20F26}\5EE8079D\CW1	csrss.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\CLSID\{22788406-694E-E14F-9635-57A764C20F26}\5EE8079D\CW1\1888 = 88000000a00700008df17d0416000600	csrss.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

csrss.exe

pid process

1888 csrss.exe
1888 csrss.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

svchost.exe

pid process

1516 svchost.exe
1516 svchost.exe
Suspicious behavior: RenamesItself 1 IoCs

Processes:

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe

pid process

2032 43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

csrss.exesvchost.exe

description pid process

Token: SeDebugPrivilege 1888 csrss.exe
Token: SeRestorePrivilege 1516 svchost.exe
Token: SeBackupPrivilege 1516 svchost.exe

pid	process
1888	csrss.exe
1888	csrss.exe

pid	process
1516	svchost.exe
1516	svchost.exe

pid	process
2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe

description	pid	process
Token: SeDebugPrivilege	1888	csrss.exe
Token: SeRestorePrivilege	1516	svchost.exe
Token: SeBackupPrivilege	1516	svchost.exe

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exeWindowsUpdatechecker.exesvchost.exe

description	pid	process	target process
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 2032 wrote to memory of 1584	2032	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1516	1584	WindowsUpdatechecker.exe	svchost.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1584 wrote to memory of 1888	1584	WindowsUpdatechecker.exe	csrss.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe
PID 1516 wrote to memory of 1592	1516	svchost.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
"C:\Users\Admin\AppData\Local\Temp\43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe"
1⤵
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:2032

C:\Users\Admin\AppData\Roaming\WindowsUpdatechecker.exe
"C:\Users\Admin\AppData\Roaming\WindowsUpdatechecker.exe"
2⤵
- Modifies WinLogon for persistence
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1584

C:\Windows\SysWOW64\svchost.exe
"C:\Windows\System32\svchost.exe"
3⤵
- Checks for any installed AV software in registry
- Checks processor information in registry
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1516

C:\Windows\SysWOW64\WerFault.exe
"C:\Windows\SysWOW64\WerFault.exe"
4⤵
PID:1592

C:\Users\Admin\AppData\Roaming\csrss.exe
"C:\Users\Admin\AppData\Roaming\csrss.exe" -reg "explorer.exe, C:\Users\Admin\AppData\Roaming\WindowsUpdatechecker.exe"
3⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1888

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Security Software Discovery

1

T1063

System Information Discovery

2

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
C:\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
\Users\Admin\AppData\Roaming\csrss.exe
Filesize
305KB

MD5
1a1733bae2a5c22dc130d2f0f82302ef

SHA1
5334d5f2c4d14c214ce4e86fe3f5098b7f38d008

SHA256
43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987

SHA512
0b9b54cc679e2c89cb296e598695df66367281793899002751ca40e56c12cdced91f10d031e8051bb70f91b4449a65d1dfd21b7884e1cfb57e1fe31092eb2e30

Download Submit
memory/1516-87-0x00000000002B0000-0x00000000002BB000-memory.dmp

Filesize
44KB

Download
memory/1516-89-0x00000000001B0000-0x00000000001FB000-memory.dmp

Filesize
300KB

Download
memory/1516-68-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-70-0x000000000040120A-mapping.dmp

Download
memory/1516-71-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-63-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-61-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-66-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-60-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-85-0x00000000001B0000-0x00000000001FB000-memory.dmp

Filesize
300KB

Download
memory/1516-59-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1516-84-0x00000000001B0000-0x00000000001FB000-memory.dmp

Filesize
300KB

Download
memory/1584-56-0x0000000000000000-mapping.dmp

Download
memory/1584-83-0x0000000074B60000-0x000000007510B000-memory.dmp

Filesize
5.7MB

Download
memory/1592-91-0x0000000077A30000-0x0000000077BB1000-memory.dmp

Filesize
1.5MB

Download
memory/1592-88-0x0000000000000000-mapping.dmp

Download
memory/1592-90-0x0000000000180000-0x00000000001CE000-memory.dmp

Filesize
312KB

Download
memory/1592-93-0x0000000000180000-0x00000000001CE000-memory.dmp

Filesize
312KB

Download
memory/1592-94-0x0000000077A30000-0x0000000077BB1000-memory.dmp

Filesize
1.5MB

Download
memory/1888-86-0x0000000074B60000-0x000000007510B000-memory.dmp

Filesize
5.7MB

Download
memory/1888-76-0x0000000000000000-mapping.dmp

Download
memory/1888-92-0x0000000074B60000-0x000000007510B000-memory.dmp

Filesize
5.7MB

Download
memory/1888-95-0x0000000000840000-0x000000000084B000-memory.dmp

Filesize
44KB

Download
memory/2032-55-0x0000000074C00000-0x00000000751AB000-memory.dmp

Filesize
5.7MB

Download
memory/2032-54-0x0000000076261000-0x0000000076263000-memory.dmp

Filesize
8KB

Download
memory/2032-57-0x0000000074C00000-0x00000000751AB000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads