Office (OLE) / .XLSX malware analysis — malicious · 8344527a2097ed23

MALICIOUS

Office (OLE) / .XLSX

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

MD5: d2df80a32c44fd32b19a7b7c86ed4db9 SHA-1: eaebdf66ad1acc37839f781885a6ec21e5465f98 SHA-256: 8344527a2097ed23a2f78609bbb5940cd25d055f5a32ea96ecd777512d2e84a5

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

The file contains Excel 4.0 macros with an Auto_Open entry, which is flagged as dangerous due to the use of the RUN function. The macro attempts to download a file from 'www.pharmainstruelec.com/nezlzltik/' and save it as '..\AppData\Kipofe.H48' using 'rundll32'. This indicates a downloader functionality, aiming to execute a second-stage payload. The presence of a lure to enable macros further supports its malicious intent.

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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