Office (OLE) / .XLS malware analysis — malicious · 3cc871c35af52e9e

MALICIOUS

Office (OLE) / .XLS

1.39 MB Created: 2009-08-26 05:32:19 Authoring application: Microsoft Excel

MD5: ca5661f795459f1d0ab643b383d784e4 SHA-1: e8db5a7a5768dfb79c820f9293e20f5fbade7b63 SHA-256: 3cc871c35af52e9e92b48a0b9b614b15c27bc1d2b24c32a9a7054b514b0f9f03

180 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing a large VBA macro. The Workbook_Open event is triggered, which uses CreateObject to execute code. This indicates the macro is designed to run automatically upon opening the document, likely to download and execute a second-stage payload. The presence of VBA Chr string obfuscation further suggests malicious intent.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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` `394a9fd5880dfe99e1c2339b51a81acfcc48cf763544f64f8cdc10866a1c4b2c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	198011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 29 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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