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

Static analysis result for SHA-256 7beaa2c237b5658e…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 55694dce851fc6374cc036f88fbd091f SHA-1: dce7a76ab67bb7a0972248c65ff93ba4f6b148f6 SHA-256: 7beaa2c237b5658e7a4a177c7ac07b22d5bb8286030bb997f7edf23141e8024e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open auto-execution macro, which is a strong indicator of malicious intent. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighsilvercrafters.com/store/wBjNOUwc/B110N4cQ6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and also references 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat' for execution. The ClamAV detection as 'Doc.Downloader.EmotetRed02220-9938909-0' further supports the downloader functionality.

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
1b55e1a4db148235ffd585376f8f2dd0c70e8fd28f90ff7f3ef2f8cc7bf745df		 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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