Office (OOXML) / .XLSM malware analysis — malicious · bc593c02bc0e1cd1

MALICIOUS

Office (OOXML) / .XLSM

43.0 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: 7c98bb36dd003e36fded4a437b748323 SHA-1: 9fb24a1cd23edc043169568295fdbb7c916662b4 SHA-256: bc593c02bc0e1cd1132beecf57c5802d974cc156bb5cfcf58c113c76bf08b680

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

The sample is an XLSM file containing VBA macros. The document body presents a lure to enable content, which is a common tactic for macro-based malware. The VBA script, when executed, reconstructs a PowerShell command to download a file named 'TSHEPO.pif' from 'http://bakoloni.site/tshepo/TSHEPO.pif' and save it to '%APPDATA%\%ProcName%'. It then executes this downloaded file. The script also attempts to create a batch file named 'Eofulro.bat' which contains the reconstructed PowerShell command.

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 (3) low OOXML_EXTERNAL_HYPERLINKS

Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846285
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 http://go.microsoft.com/fwlink/?LinkId=846285
- http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6da665b7ad7875bfd99665eec987cf630b63b6d8de41948e80a0df3a30efc39e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2604 bytes
`vbaProject_00.bin` `818ab9e4a33ade3f7c9c38330e6a3569512ee2e30ab0d08687cece66b77a917d`	vba-project	OOXML VBA project: xl/vbaProject.bin	6656 bytes

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