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

Static analysis result for SHA-256 24efe7018724237d…

MALICIOUS

Office (OOXML) / .XLSM

719.0 KB Created: 2023-01-22 11:25:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-25
MD5: 642c51e3cd42e7a0232fb8e5c5f54b74 SHA-1: 72c00ed8a6afd3b0d1e277881d697bc4d5227ddc SHA-256: 24efe7018724237d731ff3adf177fa1f027bdc94a1fbdc4c053a0539b5660de5
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro within this XLSM file utilizes WScript.Shell and PowerShell to execute a command. This command downloads a second-stage executable from the URL http://173.232.146.78/505/doc106-700-113007.exe and then executes it. This behavior is indicative of a dropper or downloader malware.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell 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
  • 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://173.232.146.78/505/doc106-700-113007.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
96dace9ff6946ccd20499e5321c64d8745b112d177a6003afb125c83e061627d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1253 bytes
vbaProject_00.bin
3515f761676189d57c505f2a6163e537a207a779047ec1c5cdb65cbb11df8a5b		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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