635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88

General

Target

635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe
Size

68KB
MD5

644274de69bf83566dcc3461fbddaa1e
SHA1

1b446810048ec608d0f531bcbcdf5caa3fb5c644
SHA256

635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88
SHA512

1a218689039d2aaa9b16be31ec6f1615163180fc9e881e7ac3f093fc836e188105f6ce84370403ed72950e1189b51f234662d68bf8998f574b39895fd9d1bfc4
SSDEEP

768:8m2HWaXqAJplmRPEW1PiGz96XyX9TdtldE9xKdM:8m0wANm5EW17zgyXVdtnPdM

Score

8^/10

defense_evasion discovery evasion

Malware Config

Signatures

Sets file to hidden 1 TTPs 1 IoCs
Modifies file attributes to stop it showing in Explorer etc.
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

1980 attrib.exe
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1164 cmd.exe
Executes dropped EXE 1 IoCs

Processes:

ayahost.exe

pid process

2076 ayahost.exe
Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

pid	process
1980	attrib.exe

pid	process
1164	cmd.exe

pid	process
2076	ayahost.exe

Drops file in Windows directory 3 IoCs

Processes:

635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exeattrib.exe

description	ioc	process
File created	C:\Windows\Debug\ayahost.exe	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe
File opened for modification	C:\Windows\Debug\ayahost.exe	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe
File opened for modification	C:\Windows\Debug\ayahost.exe	attrib.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 4 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

Processes:

cmd.exe635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exeattrib.exeayahost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ayahost.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

ayahost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	ayahost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	ayahost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe

description pid process

Token: SeIncBasePriorityPrivilege 2412 635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe

description	pid	process
Token: SeIncBasePriorityPrivilege	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe

description	pid	process	target process
PID 2412 wrote to memory of 1980	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	attrib.exe
PID 2412 wrote to memory of 1980	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	attrib.exe
PID 2412 wrote to memory of 1980	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	attrib.exe
PID 2412 wrote to memory of 1980	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	attrib.exe
PID 2412 wrote to memory of 1164	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	cmd.exe
PID 2412 wrote to memory of 1164	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	cmd.exe
PID 2412 wrote to memory of 1164	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	cmd.exe
PID 2412 wrote to memory of 1164	2412	635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe	cmd.exe

Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

1980 attrib.exe

pid	process
1980	attrib.exe

C:\Users\Admin\AppData\Local\Temp\635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe
"C:\Users\Admin\AppData\Local\Temp\635f8ff42aa12d1f87dda3c86b1fd3087c038b408cff2247a82c45d8192d4d88.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2412
- C:\Windows\SysWOW64\attrib.exe
  attrib +a +s +h +r C:\Windows\Debug\ayahost.exe
  2⤵
  - Sets file to hidden
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Views/modifies file attributes
  PID:1980
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\635F8F~1.EXE > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:1164

C:\Windows\Debug\ayahost.exe
C:\Windows\Debug\ayahost.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Checks processor information in registry
PID:2076

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

2

T1564.001

Indicator Removal

1

T1070

File Deletion

1

T1070.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\Debug\ayahost.exe

Filesize
68KB

MD5
ca4777bb69b58e483c009f975cc9e2d7

SHA1
ea0d144d2d87d5913df0a438ad530892ac5872ed

SHA256
e59ac3cdae918fe63c1bf224fc13e0f30dd5ac2e210f49760752dad638af615d

SHA512
2c92bd046911fa0d1621fcc70894f4f26e235f99574866422c4042c5b648731e83c902642df177793b6c5feb9a07f62f4736cad44ef81c1f2f2853fd5a595217

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads