Office (OLE) / .XLS malware analysis — malicious · bc53c8a087547423

MALICIOUS

Office (OLE) / .XLS

345.5 KB Created: 2022-01-26 11:52:25 Authoring application: Microsoft Excel

MD5: 1e420ae896f3a05e5611d9cec9526d15 SHA-1: 95cf71128bc03c646c4e3ac978673287dbc87d78 SHA-256: bc53c8a087547423e954a36380ba956c5725e92b16fee18689a68ce28dd81d76

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.001 PowerShell

The file is an Excel spreadsheet containing a Workbook_Open macro. This macro utilizes ShellExecuteA and URLDownloadToFileA from shell32.dll and urlmon respectively. The primary function of the macro appears to be downloading and executing a second-stage payload from a remote source, as indicated by the critical heuristic firings for URLDownloadToFile API and VBA URLDownloadToFile. The presence of these APIs and the Workbook_Open auto-execution strongly suggests a malicious intent to download and run further malicious code.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6bff43d958800e8bd442e3511bb030bca6656022c776e28089e5800e98505f0d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	137343 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 13 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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