Office (OLE) / .XLS malware analysis — malicious · 4144c20bb9858172

MALICIOUS

Office (OLE) / .XLS

448.5 KB Created: 2008-03-26 10:58:49 Authoring application: Microsoft Excel

MD5: c79ac4b349307503456942160b9f54a1 SHA-1: 8d42f47c1450c1c5a0a8c3d286caa58876c9dca6 SHA-256: 4144c20bb985817227b6b29881a5a0eec353eb4912b620c760efa00fcdd5d2dd

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel spreadsheet containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro utilizes CreateObject and GetObject calls, indicating it likely attempts to download and execute a secondary payload. The presence of a large VBA macro and the Workbook_Open auto-execution heuristic strongly suggest this malicious intent.

Heuristics 6

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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` `5eb8327ff095c7a44689850c8d0e2319d9bc0097d4ef9106552f5dfe89116413`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	71458 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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