Office (OLE) / .XLS malware analysis — malicious · 9c3c6bbc7a17f825

MALICIOUS

Office (OLE) / .XLS

269.0 KB Created: 2021-10-04 02:51:09 Authoring application: Microsoft Excel

MD5: 13d4e72a61618efcff3e6cb35cadd71a SHA-1: b7dc8f7d695418dcfdd28cc832af4c84e2b3bc00 SHA-256: 9c3c6bbc7a17f82520d093369374ab9b15cfdbb8b5451f976fc5939670cbf257

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open VBA macro. This macro utilizes the URLDownloadToFileA API to download a file from 'http://www.example.com/payload.exe' and likely executes it. The presence of ShellExecuteA API calls further suggests execution of downloaded content. The obfuscated VBA code and the use of a downloader pattern are indicative of a malicious macro-based attack.

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` `46edd0cf5eb3d76954cf17824896a6a68ce9ed2008a3663dbf0bd4f54226db56`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	39768 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 15 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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