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

Static analysis result for SHA-256 973274949ad18cfa…

MALICIOUS

Office (OLE) / .XLS

74.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-03
MD5: adbebe1397ff8c5e4543b8a01e083cc2 SHA-1: 1bc5cb79c40760bcf639e254c13d95bf3ff71f88 SHA-256: 973274949ad18cfafb3e4f4fd9e5cecb262699227e05dcfcee9bcce62e486397
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1218.011 Signed Binary Proxy Execution: Rundll32

The Workbook_Open macro is configured to execute arbitrary commands using WScript.Shell. This indicates the sample is designed to download and execute a second-stage payload. The use of WScript.Shell and Shell() calls are critical indicators of this behavior. No specific family could be identified.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
21e15f8fe76f94b1ddb7ab6d0d6dcb6b1149f9bee4a1b93b4b48ba558a5aa988		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12993 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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