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
82s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-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
5068	loader.exe

Themida packer 11 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/files/0x001000000002313c-3.dat	themida
behavioral2/files/0x001000000002313c-2.dat	themida
behavioral2/memory/5068-4-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-7-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-6-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-8-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-9-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-10-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-11-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-12-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp	themida
behavioral2/memory/5068-13-0x00007FF63C020000-0x00007FF63CABF000-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
5068	loader.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
5068	loader.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5068	loader.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 3536	1260	Kayflockmp4.exe	92
PID 1260 wrote to memory of 3536	1260	Kayflockmp4.exe	92
PID 3536 wrote to memory of 5068	3536	cmd.exe	93
PID 3536 wrote to memory of 5068	3536	cmd.exe	93
PID 5068 wrote to memory of 2880	5068	loader.exe	99
PID 5068 wrote to memory of 2880	5068	loader.exe	99
PID 2880 wrote to memory of 4756	2880	cmd.exe	100
PID 2880 wrote to memory of 4756	2880	cmd.exe	100
PID 2880 wrote to memory of 5116	2880	cmd.exe	102
PID 2880 wrote to memory of 5116	2880	cmd.exe	102
PID 2880 wrote to memory of 1228	2880	cmd.exe	101
PID 2880 wrote to memory of 1228	2880	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\Kayflockmp4.exe
"C:\Users\Admin\AppData\Local\Temp\Kayflockmp4.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1260
- 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:3536
- - 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:5068
  - - 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:2880
    - - C:\Windows\system32\certutil.exe
        
        certutil -hashfile "C:\Users\Admin\AppData\Roaming\celex-v2\loader.exe" MD5
        5⤵
        
        PID:4756
    - - C:\Windows\system32\find.exe
        
        find /i /v "certutil"
        5⤵
        
        PID:1228
    - - C:\Windows\system32\find.exe
        
        find /i /v "md5"
        5⤵
        
        PID:5116

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
1.1MB

MD5
013f74cfeee40a328b2caad8877bc31a

SHA1
3cf8b79640aefac1eff40a9f02c33580ff2ae519

SHA256
e48319f91145a6cda95994fa05d0d06dbdc8ad43b86929540d1c05863fb91f23

SHA512
e4f23a943768a41960e10141c3c52191e402eca5ba65d00f0e54e082cdc81fc13f53d64211e8cc17ad296edc811214195245a64cf8d612edeb6b382e8ea3b9f8

Download Submit
memory/5068-8-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-4-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-7-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-6-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-5-0x00007FFCD5A50000-0x00007FFCD5C45000-memory.dmp

Filesize
2.0MB

Download
memory/5068-9-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-10-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-11-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-12-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-13-0x00007FF63C020000-0x00007FF63CABF000-memory.dmp

Filesize
10.6MB

Download
memory/5068-15-0x00007FFCD5A50000-0x00007FFCD5C45000-memory.dmp

Filesize
2.0MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads