2c5521cb43cbc111995c9175a8da0df092bca37d8bf830544e42d98dbabf95a8

General

Target

f6f44d2f2611e1cad033394146808250N.exe
Size

163KB
MD5

f6f44d2f2611e1cad033394146808250
SHA1

1dff810cee8116696019f954b28b90cdb2b95dde
SHA256

2c5521cb43cbc111995c9175a8da0df092bca37d8bf830544e42d98dbabf95a8
SHA512

e7130ce13a32e3c59b4fb959606109a5abc3d8ee4940d97cde7970a8424d8e47f0a0efd3c205bda39899a8cf406f6a89582cfd1dac5fea818f8638fd47ec30da
SSDEEP

1536:kVdmQr3Z5IfQmv81aypP1s3yX+tlehTzk:008JOfQm01F9s3yX+fehTY

Score

8^/10

defense_evasion discovery evasion upx

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

pid	Process
3068	attrib.exe

Deletes itself 1 IoCs

pid	Process
2796	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2040	ayahost.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/900-0-0x0000000000400000-0x0000000000428000-memory.dmp	upx
behavioral1/files/0x000d00000001227f-3.dat	upx
behavioral1/memory/900-5-0x0000000000400000-0x0000000000428000-memory.dmp	upx
behavioral1/memory/2040-6-0x0000000000400000-0x0000000000428000-memory.dmp	upx

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

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\Debug\ayahost.exe	f6f44d2f2611e1cad033394146808250N.exe
File opened for modification	C:\Windows\Debug\ayahost.exe	f6f44d2f2611e1cad033394146808250N.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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ayahost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f6f44d2f2611e1cad033394146808250N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.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

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

description	pid	Process
Token: SeIncBasePriorityPrivilege	900	f6f44d2f2611e1cad033394146808250N.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 900 wrote to memory of 3068	900	f6f44d2f2611e1cad033394146808250N.exe	30
PID 900 wrote to memory of 3068	900	f6f44d2f2611e1cad033394146808250N.exe	30
PID 900 wrote to memory of 3068	900	f6f44d2f2611e1cad033394146808250N.exe	30
PID 900 wrote to memory of 3068	900	f6f44d2f2611e1cad033394146808250N.exe	30
PID 900 wrote to memory of 2796	900	f6f44d2f2611e1cad033394146808250N.exe	33
PID 900 wrote to memory of 2796	900	f6f44d2f2611e1cad033394146808250N.exe	33
PID 900 wrote to memory of 2796	900	f6f44d2f2611e1cad033394146808250N.exe	33
PID 900 wrote to memory of 2796	900	f6f44d2f2611e1cad033394146808250N.exe	33

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3068	attrib.exe

C:\Users\Admin\AppData\Local\Temp\f6f44d2f2611e1cad033394146808250N.exe
"C:\Users\Admin\AppData\Local\Temp\f6f44d2f2611e1cad033394146808250N.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:900
- 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:3068
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\F6F44D~1.EXE > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2796

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:2040

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
163KB

MD5
5c4fbebfb83ea3e4051cb67a592d2ea6

SHA1
ce1f6176b2941bacf37bd3a7d03c492726451522

SHA256
7ffdba7c37d9ea6bf6e457215618e5420e0a6a54ffec2839f58c7ac47e672823

SHA512
bfb38e9489c23d733df5f47b2bd93118ceae0958a4d55ed88d4378b69876d4d2d5e12f7f01aa502cd3b69129a4408264b9e0b46381795798572b885a30719f24

Download Submit
memory/900-0-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/900-5-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/2040-6-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads