Office (OLE) / .XLS malware analysis — malicious · 3b4487030cd1774d

MALICIOUS

Office (OLE) / .XLS

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

MD5: f20bd5bbcbf3234a7a5b00a201de3ba1 SHA-1: 9890a252997d0cc5845ad41a4e098448989873aa SHA-256: 3b4487030cd1774dfed6518a1932701a8c949bca30e17d9ac2074db9a35aaff9

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that uses the `REGISTER` and `EXEC` functions to call `rundll32` with a dynamically constructed path and a URL. The script attempts to download a file from 'http://www.pharmainstruelec.com/nezlzltik/' and execute it. The presence of the 'Macro/content-enable lure' heuristic indicates the document likely prompts the user to enable macros.

Heuristics 5

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical 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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `c98fe13d4ba82fb745ff6de9839a4fa0529c170f9caddc0432896ae582a60437`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1753 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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