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

Static analysis result for SHA-256 978adab29e9ea4c3…

MALICIOUS

Office (OLE) / .XLS

133.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 32babfe30cdb8d12dfaa950545dccf97 SHA-1: cac4c6c843ffb51d7ec28109a85eac64f570bff2 SHA-256: 978adab29e9ea4c3a39b1587bd9466a6ac976208b2a8e4837ef483dd2ea3bc5b
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains a Workbook_Open macro that utilizes CreateObject to instantiate Wscript.Shell. This script then proceeds to download and execute a second-stage payload from a list of hardcoded URLs. The presence of PowerShell and Wscript references, along with the ClamAV detection for 'Doc.Downloader.EmotetExcel02226-9938630-0', strongly suggests a downloader functionality. The reconstructed path 'c:\programdata\rundl32.dll' indicates a potential payload location.

Heuristics 8

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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
2371f091b169c7918c945b8974b3f60437212f84d1a9d429701826689481f8d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6376 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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