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

Static analysis result for SHA-256 ef13b4403d966a6d…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-03
MD5: 5283a53467bb9cc58e9e6f410b30f69a SHA-1: af6cb1e3b1b6fc6022f1afd05a647dd84b68fe0d SHA-256: ef13b4403d966a6da0063c33e680a0215c7d238b5e573c57585e846398b1e21f
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell 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. This command uses certutil to download a second-stage executable from the URL https://cdn.discordapp.com/attachments/948578823983726726/948721348170121296/Lqohpshnd.exe and saves it as Rqmmcqpluzlffudaxshi.exe.exe, which is then executed. The document body contains a lure to enable content, which is a common tactic for macro-based malware.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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=846285
  • 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://cdn.discordapp.com/attachments/948578823983726726/948721348170121296/Lqohpshnd.exe
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fa4f4083df4837e09e6441f423205276b3b73bd561c8f829b035b63d240a4f1e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1469 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
0a96cd1f48a69e85b720666906379c717427b883f6747f086a396f752da41648		 vba-project OOXML VBA project: xl/vbaProject.bin 6144 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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