Office (OLE) / .XLS malware analysis — malicious · 3b137cbbd7a33bbe

MALICIOUS

Office (OLE) / .XLS

1.81 MB Created: 2019-10-22 07:10:34 Authoring application: Microsoft Excel

MD5: a17e5c6d0278bc25eb69a5b39a902372 SHA-1: 34c74a1ee53e94fd1b782af2a21c38af6cca760c SHA-256: 3b137cbbd7a33bbed25b28a49a7d05ede977ad0e8cf586873bbafcfe375ec699

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open macro that uses dangerous functions like RUN. Heuristics indicate a reference to PowerShell and a suspicious extracted artifact named 'xlm_macros.txt'. The macro likely executes a PowerShell script downloaded from the embedded URL http://office-services-sec.com/crimea.ps1, which is a common delivery mechanism for malware.

Heuristics 5

Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
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.
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.
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://office-services-sec.com/crimea.ps1

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `2213e3171899d715f285a8825a68d4c5f74de19f9d753d23e355864feea790cf`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1858 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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