Office (OOXML) / .XLSM malware analysis — malicious · 80e2231f9e7e7986

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 0b21301b75f72f22fb4e7e72511775b1 SHA-1: 3130a0e1b0df346e85fe128f5366eaed10fd4666 SHA-256: 80e2231f9e7e7986cba53e447ef5f55f7c2b4d90c52d39e4eed97ff3df84604f

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing VBA macros. The 'SE_ENABLE_LURE' heuristic indicates the document likely prompts the user to enable macros. Upon activation, the VBA code reconstructs and executes a PowerShell command. This command, 'powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -File "C:\Windows\System\WindowsPowerShell\v1.0\shell.exe"', is used to download and execute a second-stage payload from the URL 'http://52.28.219.17/bi/6/WRFQ_ref-05501780309010.exe'. The 'OLE_VBA_SHELL' heuristic further confirms the use of shell execution within the VBA.

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` `1ada7473dde2526637b4f3913e4929dfbbf77431a82ef2a70b982ec3a6727df8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5980 bytes
`vbaProject_00.bin` `60ff7352a62fccd85b367bf07845849a5d1ca37ed8d4803859751934d71767ad`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes

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