Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 e7f8509a57008007…

MALICIOUS

Office (OLE) / .XLSX

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 996bb2a8a9111ee2d224bc9a4958e925 SHA-1: 88df29a35d59b50564034251a8baaeea7ace050d SHA-256: e7f8509a57008007575964eab09fa44e9761bebbd16ca1ca0036bdbf85e64815
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample contains VBA macros that trigger on Workbook_Open, indicative of malicious intent. The script constructs and executes obfuscated PowerShell commands, including a Base64 encoded string that decodes to multiple URLs. These URLs are likely used to download and execute a second-stage payload. The presence of 'Wscript.Shell' and 'CreateObject' calls further supports the execution of external commands. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests the Emotet family.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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
006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8906 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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