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

Static analysis result for SHA-256 0fefe416888a4193…

MALICIOUS

Office (OLE) / .XLS

36.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-09-14
MD5: 4e5efb8250aa5094deb1dc99e5786830 SHA-1: 42124e78ce95be3600258770a002ae01f5e70652 SHA-256: 0fefe416888a41939d0d7143846844edac1b4ee1ea5fd8f98a893ade7a62d34f
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1218.005 System Binary Proxy Execution: Mshta

The sample is an Excel file containing a Workbook_Open VBA macro. This macro calls the Shell function to execute a command. The command appears to launch mshta.exe with a URL, indicating an attempt to download and execute a secondary payload. The presence of the mshta.exe reference and the Shell() call strongly suggest this malicious behavior.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 https://www.mediafire.com/file/6vip6utwodclo5k/1.htm/file

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ae9554fe43789e0dbde44a7d85915523d0ca15b548a5a2d482282f726129b224		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2388 bytes

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