Office (OLE) / .XLS malware analysis — malicious · 4c9c09f6e1780ad1

MALICIOUS

Office (OLE) / .XLS

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

MD5: aa3b4dcdedea5ecc85b39f06af0d3073 SHA-1: 0bf041954921839b4a9e56ce437634895ba4988d SHA-256: 4c9c09f6e1780ad13e95c5c944ec7bdbf19d5814272dec489f4b6a5bb1a17287

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains an Excel 4.0 macro (XLM) with an Auto_Open function, which is a known technique for executing malicious code upon opening the spreadsheet. The macro references ShellExecute and uses dangerous functions like RUN, indicating it's designed to download and execute a payload from the embedded URL. The presence of an embedded URL further supports this conclusion.

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` `e521b3a4c580dc06510486a7c1072759a7d72a67dd5a89864e1e0c44f06c7673`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6355 bytes

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