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

Static analysis result for SHA-256 eee4f7423801c16e…

MALICIOUS

Office (OOXML) / .XLSM

66.0 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-26
MD5: d97cbb5e0fa417518eeed24b6583b4a8 SHA-1: 050ec35139ce7c53660a0481bb99c5b9a9b090ba SHA-256: eee4f7423801c16ecf4ebee38ff6402d3e003032d6b75bcd8417eaffd81f84d5
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro that executes a command using cmd.exe. This command uses certutil.exe to download and execute a file from the URL http://www.sarahburrell.info/ndxzstudio/lang/es-es/Jel1.exe. The document body attempts to trick the user into enabling macros by presenting itself as an Excel tutorial. The macro's intent is to download and execute a second-stage payload from the embedded URL.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846286
  • 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://www.sarahburrell.info/ndxzstudio/lang/es-es/Jel1.exe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://go.microsoft.com/fwlink/?LinkId=846286
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ce47478293483892ebc50ec29b1b7f03bfb66673c3156ead5c2251c1f14de359		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1444 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
f76f85537dd44a439115e09764b20f9ffef12ee459962c3a660cb81ff9b678ee		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes

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