Office (OOXML) / .XLSM malware analysis — malicious · bd4af83b1454acb3

MALICIOUS

Office (OOXML) / .XLSM

388.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: 3e1225c2e75443f3a636d149e3074f1b SHA-1: 92e5fd31696058f1f5f00136f3e7a0981f5f9466 SHA-256: bd4af83b1454acb3d9d3d14367f26bc0491e4687f8590b982dd9eafc9ab783e7

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The VBA macro within the Excel file utilizes the Shell() function to execute a PowerShell command. This command is obfuscated but reconstructs to download a file named 'wordart.exe' from 'http://transfser.sh/get/yKyMv/wordart.exe' and saves it to the user's profile directory, likely as a second-stage payload. The document also contains a lure to enable macros, which is a common technique for macro-based malware.

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=844741
- https://go.microsoft.com/fwlink/?linkid=844732
- https://go.microsoft.com/fwlink/?linkid=844744
- https://go.microsoft.com/fwlink/?linkid=844735
- https://go.microsoft.com/fwlink/?linkid=844725
- https://go.microsoft.com/fwlink/?linkid=844739
- https://go.microsoft.com/fwlink/?linkid=844751
- https://go.microsoft.com/fwlink/?linkid=844752
- https://go.microsoft.com/fwlink/?linkid=844745
- 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=844750
- https://go.microsoft.com/fwlink/?linkid=844738
- http://go.microsoft.com/fwlink/?LinkId=846285
- https://go.microsoft.com/fwlink/?linkid=844749

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `0a481100b3dc014478af7e7fed7401df7dcf9937e39c6e38f2db4042381717f2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5886 bytes
`vbaProject_00.bin` `46752870e1cd6048ade87ae8cbece8c5e6091e591a1489f709d1b0fd80ddee48`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes

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