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

Static analysis result for SHA-256 8911aa10385bd079…

MALICIOUS

Office (OLE) / .XLS

86.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-03-30
MD5: de2b13ae02c358b47fa5b8d19c3310b5 SHA-1: e12b601c5c89fff951cc7a62449753e78346498a SHA-256: 8911aa10385bd0797056f46bb387dec9e89c78fa8b59e9df40bd452b0cdb000b
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute code upon opening the spreadsheet. It constructs a path to 'C:\Users\Public\open.vbs' and writes content to it using 'Scripting.FileSystemObject'. The embedded hexadecimal strings (A01-A06) are likely obfuscated code or data for the second-stage payload. The ClamAV detection 'Doc.Downloader.DocuSign04220-9942584-0' further supports its role as a downloader.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.DocuSign04220-9942584-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.DocuSign04220-9942584-0
  • 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
80ce3f98cb1288c9197e7c231b7fbe1f2a47bf720cca04c087c42813e8536004		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2249 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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