Office (OLE) / .XLSX malware analysis — malicious · db6f93f8ce251701

MALICIOUS

Office (OLE) / .XLSX

117.0 KB Created: 2005-07-03 17:33:14 Authoring application: Microsoft Excel First seen: 2023-05-22

MD5: 5ba7487b338dd0b063dd6ed7822f25da SHA-1: 5562f593513b282ec520950f9ed3b753ba6892df SHA-256: db6f93f8ce2517014b8f47058a2a401461b55a2bf8fd3d4601459eb15b8e0ed5

282 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command and Shell T1566.002 Spearphishing Attachment

The file contains Excel 4.0 macros with an Auto_Open entry, which is a known technique for executing malicious code upon opening. The VBA macros also contain an AutoOpen subroutine that appears to execute functions related to text manipulation, potentially as a distraction or part of a larger exploit chain. The presence of both XLM and VBA macros suggests a multi-stage approach to achieve its objectives.

Heuristics 8

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.
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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
Suspicious extracted artifact info 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d138be72f4eee8a417d88911ae76719b9bf562ae0b65c439f58add81d2c671e4`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3604 bytes
`macros.bas` `dd4681e8e3c2d7a46c4ca28e3fe6cf782f071d6471179d436730ffd7b0986fc3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	39005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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