d70e292a21ebc5ca1675ca585bcae52a51aad4bcee9bbbaf44b0a2cc635b64c7

Resubmissions

07/01/2024, 17:33

240107-v5cdcaccf5 9

07/01/2024, 17:33

240107-v49mfsbdbl 9

Analysis

max time kernel
5s
max time network
80s
platform
windows10-1703_x64
resource
win10-20231215-en
resource tags

arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-x64system
submitted
07/01/2024, 17:33

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General

Target

Kayflockmp4.exe
Size

429KB
MD5

b88444cf2c03ce4efe2a1608a379ee53
SHA1

68d9285ee72288656c258cf9db9c564226a48ddb
SHA256

d70e292a21ebc5ca1675ca585bcae52a51aad4bcee9bbbaf44b0a2cc635b64c7
SHA512

7c9e116a417f2a15d2ca3f70b61697c9e34b6131b12221032cde9d64c41993f6f8cfa34196ed99122aa34d59159955d6362827f0d4eee1688bce465539e8d633
SSDEEP

12288:Zt5NpMGK6Ia5Jr4IQAvq3eSKXvVZhuwxHvh:Zt5NGGzIo3QSqOS+VZhT

Score

9^/10

evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	loader.exe

Downloads MZ/PE file

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	loader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	loader.exe

Executes dropped EXE 1 IoCs

pid	Process
3044	loader.exe

Themida packer 11 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/3044-4-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/files/0x000700000001ac1f-3.dat	themida
behavioral1/memory/3044-7-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-8-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-6-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/files/0x000700000001ac1f-2.dat	themida
behavioral1/memory/3044-9-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-10-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-12-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-11-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida
behavioral1/memory/3044-13-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	loader.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
3044	loader.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3044	loader.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3044	loader.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 4308	2112	Kayflockmp4.exe	62
PID 2112 wrote to memory of 4308	2112	Kayflockmp4.exe	62
PID 4308 wrote to memory of 3044	4308	cmd.exe	63
PID 4308 wrote to memory of 3044	4308	cmd.exe	63
PID 3044 wrote to memory of 1136	3044	loader.exe	77
PID 3044 wrote to memory of 1136	3044	loader.exe	77
PID 1136 wrote to memory of 3504	1136	cmd.exe	80
PID 1136 wrote to memory of 3504	1136	cmd.exe	80
PID 1136 wrote to memory of 1324	1136	cmd.exe	79
PID 1136 wrote to memory of 1324	1136	cmd.exe	79
PID 1136 wrote to memory of 1360	1136	cmd.exe	78
PID 1136 wrote to memory of 1360	1136	cmd.exe	78

C:\Users\Admin\AppData\Local\Temp\Kayflockmp4.exe
"C:\Users\Admin\AppData\Local\Temp\Kayflockmp4.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c start C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4308
- - C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe
    C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe
    3⤵
    - Identifies VirtualBox via ACPI registry values (likely anti-VM)
    - Checks BIOS information in registry
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3044
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe" MD5 | find /i /v "md5" | find /i /v "certutil"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1136
    - - C:\Windows\system32\find.exe
        
        find /i /v "certutil"
        5⤵
        
        PID:1360
    - - C:\Windows\system32\find.exe
        
        find /i /v "md5"
        5⤵
        
        PID:1324
    - - C:\Windows\system32\certutil.exe
        
        certutil -hashfile "C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe" MD5
        5⤵
        
        PID:3504

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe

Filesize
92KB

MD5
dff3ba57c63f615ff2980c700f4e9bdc

SHA1
606a493c14a1ead250f07f46e8a943a14d0788a8

SHA256
90ec0d57ae44cb447d256d69daaaa3066d1c528f087a2eae6f0394c915e16fba

SHA512
1c6521857ba197c3c60e437aa7a75a84959cee15137ee64695b81322d467e2d4cf7cf408ea1490f54edbd3b657c3b4b78f52b85b6835146f8b279cebebf56221

Download Submit
memory/3044-10-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-12-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-8-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-6-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-4-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-9-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-5-0x00007FFBA2A20000-0x00007FFBA2BFB000-memory.dmp

Filesize
1.9MB

Download
memory/3044-7-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-11-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-13-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-15-0x00007FFBA2A20000-0x00007FFBA2BFB000-memory.dmp

Filesize
1.9MB

Download
memory/3044-20-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-21-0x00007FF732D20000-0x00007FF7337BF000-memory.dmp

Filesize
10.6MB

Download
memory/3044-22-0x00007FFBA2A20000-0x00007FFBA2BFB000-memory.dmp

Filesize
1.9MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads