Office (OLE) / .XLS malware analysis — malicious · 8a8342cc8ba210ff

MALICIOUS

Office (OLE) / .XLS

35.5 KB Created: 2021-04-29 09:15:21 Authoring application: Microsoft Excel

MD5: e60958db2ed605a2f41cff41f595ccad SHA-1: 9c36ff84b707c2a9fe44497e8b83b4223303500f SHA-256: 8a8342cc8ba210ff94ea267c02c5e223635e9ff0a41c1aeae352b65acdc89466

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1546.003 Event Triggered Execution: Windows Management Instrumentation

The file is an Excel spreadsheet containing VBA macros. A high-confidence heuristic indicates the presence of a Workbook_Open macro, which is designed to execute automatically when the workbook is opened. This macro uses CreateObject, suggesting it likely attempts to download and execute a second-stage payload. No specific family could be identified, and no external IOCs were extracted.

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` `227b9947b1b5959b237f8fa6ee60f2e7a4c4053399049beff1ff2e732f3b1d4b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3741 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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