Office (OLE) / .XLS malware analysis — malicious · de80a76f56297b59

MALICIOUS

Office (OLE) / .XLS

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

MD5: ac4b42fa597ca56166ac16746eb577ad SHA-1: ae8e9da024fe26554653bc37898b437fa80e64da SHA-256: de80a76f56297b594afc275893e15592265a2854958097ac95ff22adfab63db6

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The presence of ShellExecute API calls and dangerous formulas like RUN suggests the macro is designed to execute arbitrary code. The embedded URL likely serves as a download source for a secondary payload. The macro's intent is to download and execute a second-stage payload from the embedded URL.

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` `33b6a73d5f0d6eaa82513d86953f6aef905a69517ef33e4eba1db75f4a178a6f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6298 bytes

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