2f1aff28961ba0ce85ea0e35b8936bc387f84f459a4a1d63d964ce79e34b8459

Analysis

max time kernel
142s
max time network
130s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
29-08-2024 06:46

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General

Target

exbuild.exe
Size

416KB
MD5

f5d7b79ee6b6da6b50e536030bcc3b59
SHA1

751b555a8eede96d55395290f60adc43b28ba5e2
SHA256

2f1aff28961ba0ce85ea0e35b8936bc387f84f459a4a1d63d964ce79e34b8459
SHA512

532b17cd2a6ac5172b1ddba1e63edd51ab53a4527204415241e3a78e8ffeb9728071bde5ae1eefabefd2627f00963f8a5458668cd7b8df041c8683252ff56b46
SSDEEP

12288:ISqMakU3v+GYLWIjD9dSbvBG5u2uQjdQco:jq53v+G4Wwub8Ljaco

Score

7^/10

discovery

Malware Config

Signatures

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

exbuild.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	exbuild.exe

Executes dropped EXE 4 IoCs

Processes:

Hkbsse.exeHkbsse.exeHkbsse.exeHkbsse.exe

pid	Process
3464	Hkbsse.exe
4588	Hkbsse.exe
1380	Hkbsse.exe
1084	Hkbsse.exe

Drops file in Windows directory 1 IoCs

Processes:

exbuild.exe

description	ioc	Process
File created	C:\Windows\Tasks\Hkbsse.job	exbuild.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 2 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:

Hkbsse.exeexbuild.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Hkbsse.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	exbuild.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

exbuild.exe

description	pid	Process	procid_target
PID 2416 wrote to memory of 3464	2416	exbuild.exe	87
PID 2416 wrote to memory of 3464	2416	exbuild.exe	87
PID 2416 wrote to memory of 3464	2416	exbuild.exe	87

C:\Users\Admin\AppData\Local\Temp\exbuild.exe
"C:\Users\Admin\AppData\Local\Temp\exbuild.exe"
1⤵
- Checks computer location settings
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2416
- C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
  "C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:3464

C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
1⤵
- Executes dropped EXE
PID:4588

C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
1⤵
- Executes dropped EXE
PID:1380

C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe
1⤵
- Executes dropped EXE
PID:1084

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\054fdc5f70\Hkbsse.exe

Filesize
416KB

MD5
f5d7b79ee6b6da6b50e536030bcc3b59

SHA1
751b555a8eede96d55395290f60adc43b28ba5e2

SHA256
2f1aff28961ba0ce85ea0e35b8936bc387f84f459a4a1d63d964ce79e34b8459

SHA512
532b17cd2a6ac5172b1ddba1e63edd51ab53a4527204415241e3a78e8ffeb9728071bde5ae1eefabefd2627f00963f8a5458668cd7b8df041c8683252ff56b46

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