7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7

General

Target

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
Size

316KB
MD5

09eb8065d77bbd93f745c38444b46fda
SHA1

dce6348b5276331c9f02cc95041c05b05687f867
SHA256

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7
SHA512

d03530dd115c31abe4c7fab2d8d8817bd88b0ddb6a6d2cdc31294402d0911c60a7cf3d5940c596f9ab6d83d8046dcb907a987cef0b5fd78932d5035292f247b8
SSDEEP

6144:tESB9zuJRyIghtsKnvmb7/D26EO/v5WbBX7zZ8RzRNjL6ZkCnbM3F1QSBx8evAZH:tjtIghtsKnvmb7/D26FWbBX7zZ8RzRNd

Score

10^/10

evasion persistence

Malware Config

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

Modify Registry

T1112

Processes:

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exekoiyau.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	koiyau.exe

Executes dropped EXE 1 IoCs

Processes:

koiyau.exe

pid process

1676 koiyau.exe

pid	process
1676	koiyau.exe

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

Processes:

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe

Adds Run key to start application 2 TTPs 54 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

koiyau.exe7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /z"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /n"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /q"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /i"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /J"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /o"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /Q"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /r"	koiyau.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /G"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /f"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /j"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /A"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /a"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /M"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /P"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /y"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /Z"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /t"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /V"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /D"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /C"	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /S"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /R"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /W"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /I"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /c"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /s"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /v"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /l"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /L"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /B"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /E"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /H"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /u"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /g"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /Y"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /N"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /e"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /C"	koiyau.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /X"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /p"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /x"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /K"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /k"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /w"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /m"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /d"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /F"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /h"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /T"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /O"	koiyau.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\koiyau = "C:\\Users\\Admin\\koiyau.exe /U"	koiyau.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exekoiyau.exe

pid	process
2472	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
2472	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe
1676	koiyau.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exekoiyau.exe

pid process

2472 7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
1676 koiyau.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe

description	pid	process	target process
PID 2472 wrote to memory of 1676	2472	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe	koiyau.exe
PID 2472 wrote to memory of 1676	2472	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe	koiyau.exe
PID 2472 wrote to memory of 1676	2472	7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe	koiyau.exe

C:\Users\Admin\AppData\Local\Temp\7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe
"C:\Users\Admin\AppData\Local\Temp\7bebfe88ee266757c1afeec03e4ace08f998b9d9218fcef1a8f54779078a50e7.exe"
1⤵
- Modifies visiblity of hidden/system files in Explorer
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2472

C:\Users\Admin\koiyau.exe
"C:\Users\Admin\koiyau.exe"
2⤵
- Modifies visiblity of hidden/system files in Explorer
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:1676

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

1

T1158

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\koiyau.exe

Filesize
316KB

MD5
7de9c904e2bd80d1b34eaeaa56f4485d

SHA1
b3cf1526471bbd7422ada1876d50eb56332f65b3

SHA256
e9528d22ed5b9cfafc5ac885940318505455a79121fb79e17ed2d278cf3b38ba

SHA512
3b22f066f18ed15f8b7c1ccf796b3637129808728231bb7694e60f195b2440028e7743a17b9fb9a553f6383d4dea6a0bc8ee63725d641ecf08136f1205da0d66

Download Submit
C:\Users\Admin\koiyau.exe

Filesize
316KB

MD5
7de9c904e2bd80d1b34eaeaa56f4485d

SHA1
b3cf1526471bbd7422ada1876d50eb56332f65b3

SHA256
e9528d22ed5b9cfafc5ac885940318505455a79121fb79e17ed2d278cf3b38ba

SHA512
3b22f066f18ed15f8b7c1ccf796b3637129808728231bb7694e60f195b2440028e7743a17b9fb9a553f6383d4dea6a0bc8ee63725d641ecf08136f1205da0d66

Download Submit
memory/1676-134-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads