Office (OLE) / .DOCX malware analysis — malicious · 1cb45238fc3fa833

MALICIOUS

Office (OLE) / .DOCX

80.5 KB Created: 2021-08-05 18:51:00 Authoring application: Microsoft Office Word

MD5: af9c6107c0af8704755f7bc3b81ff716 SHA-1: f2401fe50f24f238c941c51df20f691ddda96185 SHA-256: 1cb45238fc3fa833a7c95cdd968f2bec141ff231b77f3903d5b020d4a2a74df8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Document_Open macro executes a batch file that downloads an executable from 'https://thundercrack.org/offupdate.exe' to 'C:\Users\Public\everyonehigh.exe' and then executes it. The batch file itself is written to 'C:\Users\Public\fsv.bat'. This indicates a downloader pattern designed to fetch and run a second-stage payload.

Heuristics 6

Document_Open macro high OLE_VBA_DOCOPEN

Document_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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b057d8f1fdfa16301005be4612736388d9db56a50f2cac88554f5ea55f19314b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	810 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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