Office (OLE) / .XLSX malware analysis — malicious · 04654c506c9018ac

MALICIOUS

Office (OLE) / .XLSX

56.5 KB Created: 2021-08-19 15:58:33 Authoring application: Microsoft Excel

MD5: 56675c71fc4d24043b4e985a8b08110a SHA-1: c234c57f575c90b1a87ddbfbe96c07ce47f32c93 SHA-256: 04654c506c9018accebb4a278d7cb234f5e6504ef8153eb470dc63a8c8bd725d

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. The macro attempts to download a file from 'http://cocinashogarmobiliario.com/photo.png' using 'curl' and then execute it using 'rundll32'. This suggests a downloader or initial access payload.

Heuristics 6

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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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.
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.
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 http://cocinashogarmobiliario.com/photo.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `604837ccd2f420a4dd379ab04a73baea48dd30647f2f33d0394ecf82a65c118d`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3705 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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