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

Static analysis result for SHA-256 1cbf86cfae70a164…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 42e571b6d9f7525f201294e73d3a5cc9 SHA-1: b6ef578a4b905bc032b82f6e56470c615bd110ae SHA-256: 1cbf86cfae70a164a22c6ab3ef60fe139ba4b9023999627cb0405c16c11f749f
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The file contains VBA macros that are automatically executed upon opening the workbook, indicated by the Workbook_Open heuristic. The script utilizes Wscript.Shell to execute a batch file located at 'c:\programdata\jledshf.bat'. It also attempts to run a DLL from a specific path. The reconstructed URL 'http://moneyquotal.ja.deals/assets/jCwxxvUSPE7VhWxJ/https://vestaseguridab.com.ar/wp-content/7JD9gufnwG/,http://mail.rededucacionvirtual.com/wp-includes/,http://veluxcucumberapi.orbitavaves.it/assets/W9KfK84' suggests a download and execution chain. The ClamAV detection as 'Doc.Downloader.EmotetExcel02226-9938630-0' further supports its malicious nature as a downloader.

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
c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5709 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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