Office (OLE) / .XLS malware analysis — malicious · bb98b86b64c3f9e8

MALICIOUS

Office (OLE) / .XLS

378.5 KB Created: 2020-09-20 21:14:09

MD5: c3d937a32ff0af04a6d103f2386bc82b SHA-1: 43748d8b028d960c34c2129f757f0730ab505ece SHA-256: bb98b86b64c3f9e8bc6fa56bb70aa5b059d4adb9b12481abd82310307fb4203c

140 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLS file containing VBA macros, specifically a Workbook_Open macro which is a common technique for auto-execution. The CreateObject heuristic suggests the macro attempts to instantiate objects to perform malicious actions, likely downloading and executing a second-stage payload. The presence of 'macros.bas' indicates the extracted macro source file.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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` `644f505d2b1f72133024f2b32b80b30bda23b4f13269494c86c75267285dbd25`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1829 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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