Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 3e3ac43a9042b51f…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 6cb6c0bc5a4bf1579646472b8b8981a6 SHA-1: cda5421d957c3c8fadfeda44a3d664537708f43d SHA-256: 3e3ac43a9042b51f788bf3a57b7e57a77ceab0fc256e450cfe084c5fd8e8216e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file that contains a Workbook_Open macro. This macro is designed to execute a series of commands, including the creation of two files in the \`c:\programdata\` directory: \`oue4hjld.vbs\` and \`bhnasleil.bat\`. The script also attempts to download a second-stage payload from a list of URLs, including \`http://midnighthsilvercraft.com/store/wBjNOUw/B110N4cQA6R3/\`. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further suggests a downloader family.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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.

FilenameKindSourceSize
macros.bas
104e6909219faf3c9d68252fdbc2d02766f11aa7d23580b0077d069eeb7098d2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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