Office (OLE) / .XLS malware analysis — malicious · 4e2b539d80a7ddac

MALICIOUS

Office (OLE) / .XLS

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

MD5: b9a31621cba71ebe7097d9f4ef7ccb1f SHA-1: 5a112efc5b35ee7da7a5bb99249946e712000a43 SHA-256: 4e2b539d80a7ddace4eabddc6c7bc89cbbc32d89c7e9ef3ece3750bdedab708c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. This indicates an attempt to execute arbitrary code upon opening the document. The embedded URL likely serves as a download location for a secondary payload. The presence of ShellExecute API calls further supports the execution of external commands.

Heuristics 4

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 https://birdexim.com/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `b9e922997ab1008b6d5ca8df5e57db733535c15f4d8d4ecbbf5827b941f024c9`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6069 bytes

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