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

Static analysis result for SHA-256 92799b50b533f0b7…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-07-04
MD5: d79715d1558960750107dac48acd9aee SHA-1: 76e635b3387a22a15fcccd91300c7381d0687cfa SHA-256: 92799b50b533f0b784af001522020b74b25e6284f8da8677c3fb2abe64f8899a
370 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate or Obfuscate Malicious Code T1059.003 Windows Command Shell

The Workbook_Open macro executes a command that uses certutil.exe to download and save a file named 'Gzsoummoljku.exe.exe' from 'https://amcoretrust.com/Gwzhbbje.exe', and then immediately executes it. This is a common pattern for macro-based downloaders. The document body itself contains a lure to enable content, which is typical for this type of attack.

Heuristics 10

  • 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
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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://amcoretrust.com/Gwzhbbje.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
b210b8e7bb508a7aa852b3edcf99f0e8abba456eaa214bdf77ee4adc308f2e41		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1399 bytes
vbaProject_00.bin
33e33bf317b5355bf5f090df12fd2896047d39547291eba3f2589fe5f76f18ae		 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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