Office (OLE) / .XLSX malware analysis — malicious · b4d2901e6abec4d5

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 158457f11812ac2d861ffdaadca02203 SHA-1: 0b3aa73c6ec1c2a9987bc81874c181285843fbe3 SHA-256: b4d2901e6abec4d50b8da63b36ff8958b299aec4a5bd389a902b10978163e1b0

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting - PowerShell T1105 Ingress Tool Transfer

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN and ShellExecute, strongly indicates a downloader. The embedded URL points to a GIF file, likely a lure to disguise the malicious payload. The script's intent is to download and execute a second-stage payload from the provided URL, which is a common technique for malware delivery.

Heuristics 5

ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
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://ippp.co.zw/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `de64c8aedb9841e9622ce89b4c2a59532a2613bac9a0b05117fd5443ba276b2f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7888 bytes

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