Office (OOXML) / .XLSM malware analysis — malicious · 20d4be06e6eb3b24

MALICIOUS

Office (OOXML) / .XLSM

27.3 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-28

MD5: bb155e0582679e7da9d106f72dc104ad SHA-1: ffdb36c401b5c31bd8445aed651cb0dd8ec97910 SHA-256: 20d4be06e6eb3b24ad927696a212f26651e0bbba4f04078cc2d6b67679ab48e5

382 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The file is an XLSM document containing a Workbook_Open macro that executes a command using cmd.exe. The command uses certutil.exe to download a second-stage executable from the URL http://18.179.111.240/1b1/loader/uploads/Docu1067400023.exe and then executes it. This indicates a downloader or dropper functionality.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
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://18.179.111.240/1b1/loader/uploads/Docu1067400023.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3c82841caf8a138aa2e53b33af25b65a5bf11c6c927866797f3310221dc8b44e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `01243ac42ad84fcfa4a772d18ea6a72673015074a807b2f696513c4c6c1b7b25`	vba-project	OOXML VBA project: xl/vbaProject.bin	5632 bytes
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: unlikely

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