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

Static analysis result for SHA-256 9160de8dfd03391c…

MALICIOUS

Office (OLE) / .XLS

86.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-03-30
MD5: 4dcccd172457156f33a49414fdc2bd10 SHA-1: a6131af66ce367708832d9a72ec9a9b7205f9b29 SHA-256: 9160de8dfd03391c058b4ae681618ae5c3fddf9baba2cb11fd533f3180a8969d
340 Risk Score

Malware Insights

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

The critical OLE_VBA_SHELL heuristic indicates the use of the Shell() function, and the OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic confirms an auto-execution macro (Workbook_Open) that uses CreateObject. The script itself constructs a path to write a file named 'open.vbs' to the user's public directory and then attempts to execute it using 'WScript.Shell'. The repeated, long hexadecimal strings are likely obfuscated payload data. The ClamAV detection as 'Doc.Downloader.DocuSign04220-9942584-0' further supports a downloader role.

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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