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

Static analysis result for SHA-256 ca75166b4cbaa7d6…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 81f53bc2a8b62a6a4e09a31e9e28c8e8 SHA-1: 214ca98671e6709e25efe933d96a97d464253e10 SHA-256: ca75166b4cbaa7d6fe3a5dd22af3aa4fe1b5e2feb8b75c9c6c37aab010165717
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that executes obfuscated commands. These commands appear to be responsible for downloading and executing additional payloads from URLs such as 'http://midnighitsilverbcraft.com/store/wBjNOUwc/B110N4cA6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cA6R3/', and also attempts to write files to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further suggests a 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
256498a6d63270d3c70e0f4eeb29c087d630d4d14205f1ba6d67b00ef025a991		 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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