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-1-5-21-929662420-1054238289-2961194603-1000\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-1-5-21-929662420-1054238289-2961194603-1000\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

2300 csrss.exe

pid	process
2300	csrss.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exeWindowsUpdatechecker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	WindowsUpdatechecker.exe

Obfuscated with Agile.Net obfuscator 2 IoCs

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

agilenet

Processes:

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

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 SetThreadContext 1 IoCs

Processes:

WindowsUpdatechecker.exe

description pid process target process

PID 4712 set thread context of 452 4712 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
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

4888 2620 WerFault.exe svchost.exe

description	pid	process	target process
PID 4712 set thread context of 452	4712	WindowsUpdatechecker.exe	svchost.exe

pid	pid_target	process	target process
4888	2620	WerFault.exe	svchost.exe

Checks processor information in registry 2 TTPs 4 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.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	svchost.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\1	svchost.exe

Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

svchost.exe

pid process

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

Processes:

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe

pid process

1368 43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

svchost.execsrss.exe

description pid process

Token: SeRestorePrivilege 452 svchost.exe
Token: SeBackupPrivilege 452 svchost.exe
Token: SeDebugPrivilege 2300 csrss.exe

pid	process
452	svchost.exe
452	svchost.exe

pid	process
1368	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe

description	pid	process
Token: SeRestorePrivilege	452	svchost.exe
Token: SeBackupPrivilege	452	svchost.exe
Token: SeDebugPrivilege	2300	csrss.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exeWindowsUpdatechecker.exesvchost.exe

description	pid	process	target process
PID 1368 wrote to memory of 4712	1368	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 1368 wrote to memory of 4712	1368	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 1368 wrote to memory of 4712	1368	43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe	WindowsUpdatechecker.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 452	4712	WindowsUpdatechecker.exe	svchost.exe
PID 4712 wrote to memory of 2300	4712	WindowsUpdatechecker.exe	csrss.exe
PID 4712 wrote to memory of 2300	4712	WindowsUpdatechecker.exe	csrss.exe
PID 4712 wrote to memory of 2300	4712	WindowsUpdatechecker.exe	csrss.exe
PID 452 wrote to memory of 2620	452	svchost.exe	svchost.exe
PID 452 wrote to memory of 2620	452	svchost.exe	svchost.exe
PID 452 wrote to memory of 2620	452	svchost.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe
"C:\Users\Admin\AppData\Local\Temp\43957594ef8ae331dad685cf5fdfdb1fcdfe4b040ddf776cd2bf53ce8df11987.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:1368

C:\Users\Admin\AppData\Roaming\WindowsUpdatechecker.exe
"C:\Users\Admin\AppData\Roaming\WindowsUpdatechecker.exe"
2⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4712

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:452

C:\Windows\SysWOW64\svchost.exe
-k NetworkService
4⤵
PID:2620

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2620 -s 88
5⤵
- Program crash
PID:4888

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
- Suspicious use of AdjustPrivilegeToken
PID:2300

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2620 -ip 2620
1⤵
PID:1996

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Security Software Discovery

1

T1063

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

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
memory/452-144-0x0000000001760000-0x00000000017AB000-memory.dmp

Filesize
300KB

Download
memory/452-142-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/452-136-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/452-137-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/452-138-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/452-135-0x0000000000000000-mapping.dmp

Download
memory/452-139-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/452-151-0x0000000003560000-0x000000000356B000-memory.dmp

Filesize
44KB

Download
memory/452-150-0x0000000001760000-0x00000000017AB000-memory.dmp

Filesize
300KB

Download
memory/1368-134-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download
memory/1368-132-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download
memory/2300-152-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download
memory/2300-145-0x0000000000000000-mapping.dmp

Download
memory/2300-154-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download
memory/2620-149-0x0000000000000000-mapping.dmp

Download
memory/2620-153-0x0000000077B50000-0x0000000077CF3000-memory.dmp

Filesize
1.6MB

Download
memory/4712-148-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download
memory/4712-133-0x0000000000000000-mapping.dmp

Download
memory/4712-140-0x00000000752A0000-0x0000000075851000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads