Office (OLE) / .XLS malware analysis — malicious · 1fed6a73d96f2255

MALICIOUS

Office (OLE) / .XLS

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

MD5: 6d2fd4e027b121049f98cdc2268d69a6 SHA-1: 3dcb7793b1f190ae1922bc6655a00ec0fa92d88a SHA-256: 1fed6a73d96f2255f1763fbf443514d3ec5fa06522e64a0b1a65e8f170e7516a

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLS file contains a Workbook_Open VBA macro that triggers a game-like interface when the user interacts with specific cells. The macro obfuscates its strings using XOR encoding with a key of 0xFC. While the macro's ultimate payload is not fully discernible due to truncation, the presence of obfuscated strings and the Workbook_Open trigger suggest a malicious intent, likely to download and execute a secondary payload or to phish for credentials.

Heuristics 5

XOR-encoded strings (key 0xFC) critical SC_XOR_ENCODED

Found 2 Windows library/API name(s) XOR-encoded with single-byte key 0xFC: 'LoadLibraryA', 'GetProcAddress'
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `c2d076a6e609a8b33579240c4c97ddb741702fb224c691665176231441d0ac2f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	17509 bytes
`macros.bas` `17f070fbd1db17996c527b2aabff45e326f6930716fc4345abb4744d6a5f3704`	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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