Office (OLE) / .XLS malware analysis — malicious · 393ffc85a8c8c8f5

MALICIOUS

Office (OLE) / .XLS

192.0 KB Created: 1999-12-24 16:36:33 Authoring application: Microsoft Excel

MD5: dcdd161dc2cd4d9053a26a97cb5a20ba SHA-1: a844844680b5855af94a363528bc3997ac1da79f SHA-256: 393ffc85a8c8c8f5552671391ab2a65ae2a4359cece0f957996110c2e13310f9

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The file is an Excel XLS document containing both XLM and VBA macros. The presence of a Workbook_Open macro and the 'Suspicious extracted artifact' heuristic firing indicate that the VBA macros are designed to execute malicious code. The embedded URL http://3k-email.gicp.net:88/m.exe is likely used to download and execute a second-stage payload. The XLM macro sheet marker also suggests older macro execution techniques may be present.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Suspicious extracted artifact high 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.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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://3k-email.gicp.net:88/m.exe�

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `1e2146545f848881b6974ace600b15cc6a57bb6c0dbcce63506efaed6758b4fd`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	17500 bytes
`macros.bas` `6c702377884453dd615b8e29c81ed4bae0677f0493b967d93fb7c71959bc62e5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	27433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 30 Chr/ChrW string-construction calls.

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