Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 bbff2bce7c553d1e…

MALICIOUS

Office (OOXML) / .XLSM

163.1 KB Created: 2023-01-22 11:25:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-15
MD5: a1a45847a65b6b39bce75c35174054f6 SHA-1: 4ca6d35e97aa05ac5f00468afe82eafd53e87cad SHA-256: bbff2bce7c553d1e11b48a38bfd351f9e715b683171f596751d78ace10782e79
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The Workbook_Open macro is obfuscated and uses WScript.Shell to execute a PowerShell command. This command bypasses execution policy, downloads a file from http://193.203.203.67/rt/Doc-3737122pdf.exe, saves it as an executable in the temp directory, and then executes it. This indicates a downloader functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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 http://193.203.203.67/rt/Doc-3737122pdf.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0c5f4e853d38d7b34c0605c0a70b3ac041b87b6db478d8f97fc5aea213c55669		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1276 bytes
vbaProject_00.bin
753597632ba30865664cf41292cc906640e87967e2e423a9dc7fbbe81025c4d7		 vba-project OOXML VBA project: xl/vbaProject.bin 4608 bytes

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