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

Static analysis result for SHA-256 c1afb561cd5363ac…

MALICIOUS

Office (OLE) / .XLS

10.33 MB Created: 2007-07-16 10:36:33 Authoring application: Microsoft Excel First seen: 2022-04-05
MD5: da305627acf63792acb02afaf83d94d1 SHA-1: b4100aad572f619632ec28042a76c52ba2350acc SHA-256: c1afb561cd5363ac5826ce7a72f0055b400b86bd7524da43474c94bc480d7eff
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel spreadsheet containing a Workbook_Open macro that utilizes WScript.Shell to execute commands. This macro is designed to download and execute a second-stage payload from the URLs http://ExcelVBA.ru/ and http://ExcelVBA.ru/payments. The ClamAV detection 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' further supports its malicious nature as a dropper. The document body content appears to be statistical data related to Ukrainian businesses, likely a lure to disguise the malicious macro.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ExcelVBA.ru/
    • http://ExcelVBA.ru/payments

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4cea09615f3690d03dc67534b0bbbfc810fe800bb763317dc09ed448dbfb405e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 25552 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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