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

Static analysis result for SHA-256 40a3b496a2f846ef…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 3b381e3ec5cc3e526d9c12dfd3b4ff51 SHA-1: 899959ffa8e30daade07fe569402d99b5f45e26a SHA-256: 40a3b496a2f846ef11aac5300c80d657b887066ba0bbc59cfb8793eaa86fae5a
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell T1204.002 Malicious File

The sample contains VBA macros that leverage Wscript.Shell to execute local files. Specifically, it attempts to run 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'. The VBA code reconstructs the command to execute the VBScript by concatenating strings, and also reconstructs a command line that appears to be an encoded PowerShell command. The presence of Wscript.Shell and the execution of local scripts indicate a downloader or initial execution stage.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 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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