Office (OLE) / .XLS malware analysis — malicious · 90ff299b6802126c

MALICIOUS

Office (OLE) / .XLS

163.0 KB Created: 1999-11-30 09:36:42 Authoring application: Microsoft Excel

MD5: abe96f72a1125a22c9f5829e3aaafde7 SHA-1: 825fa140c57c5a9dd7995983c0cbd8cb2b60ba28 SHA-256: 90ff299b6802126c6ab1ce7953c36ff51f80c71a840a98853fd9357681402d35

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell

The file is an Excel spreadsheet containing a VBA macro. The Auto_Open macro is present and uses a Shell() call, indicating it is designed to execute arbitrary commands. The macro is likely responsible for downloading and executing a second-stage payload. No specific family could be identified.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Auto_Open macro high OLE_VBA_AUTO

Auto_Open 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.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `387105dc306c7e6eacfcd6c17c1c42843010b2ffbe881bcc91b6de61f97a4c9e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9947 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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