b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538

Analysis

max time kernel
140s
max time network
125s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
01/05/2024, 02:22

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General

Target

b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe
Size

65KB
MD5

467ec21e6e8272654dfc49b608f79929
SHA1

cbc0de01c56bd61dec046e1e488adc4913543281
SHA256

b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538
SHA512

a707851550c64f702fc7ac9d83b7c6b8f3b260d7a65c740a870582efe23ec3c16dfae1e3a280c17d2f1cbd2654c99b3ffcac2639ad2f05fbd32516fa1d7451d1
SSDEEP

768:ZrItKyw5WHXfQIhIiIk9ecAaVPD96KyX67:Zr3Z5IfQIR81ad5yX67

Score

9^/10

evasion

Malware Config

Signatures

Detects Windows executables referencing non-Windows User-Agents 5 IoCs

resource	yara_rule
behavioral1/memory/1936-0-0x0000000000400000-0x0000000000411000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/files/0x000a000000014af6-3.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2740-5-0x0000000000400000-0x0000000000411000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/1936-6-0x0000000000400000-0x0000000000411000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2740-7-0x0000000000400000-0x0000000000411000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

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
2184	attrib.exe

Deletes itself 1 IoCs

pid	Process
812	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2740	ayahost.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\Debug\ayahost.exe	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe
File opened for modification	C:\Windows\Debug\ayahost.exe	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.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

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1936 wrote to memory of 2184	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	28
PID 1936 wrote to memory of 2184	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	28
PID 1936 wrote to memory of 2184	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	28
PID 1936 wrote to memory of 2184	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	28
PID 1936 wrote to memory of 812	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	31
PID 1936 wrote to memory of 812	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	31
PID 1936 wrote to memory of 812	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	31
PID 1936 wrote to memory of 812	1936	b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe	31

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2184	attrib.exe

C:\Users\Admin\AppData\Local\Temp\b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe
"C:\Users\Admin\AppData\Local\Temp\b4fd39b6b00d72034fe303bffa58d8bfd1e6c4631ae9ee9cb7a011cdb3dc6538.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1936
- 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
  - Views/modifies file attributes
  PID:2184
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\B4FD39~1.EXE > nul
  2⤵
  - Deletes itself
  PID:812

C:\Windows\Debug\ayahost.exe
C:\Windows\Debug\ayahost.exe
1⤵
- Executes dropped EXE
PID:2740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\Debug\ayahost.exe

Filesize
65KB

MD5
438e920d476599953bc20a63b949998c

SHA1
ad31e673ef5bdfa6451e144c4eb83b1adb488121

SHA256
ae58f50aa701291800a091906a33f45015baa8d32dbda6b9fefce8989d60f3ff

SHA512
abdd2a4781eb185f28a0225cf27ef857670184b6888575b6c51fdeb6e7ea40aab1cc0df77812a03491c3752631ec8814d19b96a21b2a1299c1392674e9c9d468

Download Submit
memory/1936-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1936-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2740-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2740-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads