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

Static analysis result for SHA-256 b1cb6321f2ebbbb2…

MALICIOUS

Office (OOXML) / .XLSM

42.1 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-01-23
MD5: bb56560a5d74605f66f9a79024ff36a8 SHA-1: dfa9ee8666792610e933f37ef4b809d105bd6d0b SHA-256: b1cb6321f2ebbbb2f5a02ebc78f70dcfbc182be63660f8fa4da9ea0b8048d3f3
430 Risk Score

Malware Insights

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

The sample is an XLSM file containing a Workbook_Open macro that utilizes WScript.Shell and PowerShell to download and execute a payload from http://198.23.172.90/invoice12.exe. The document body attempts to trick the user into enabling content by presenting itself as an Excel tour, which is a common lure for macro-based malware.

Heuristics 11

  • 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
  • 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 http://198.23.172.90/invoice12.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
019314500cb19ee35227300d5f9a64fa6e75976e818d86b422f3df0afd025e7c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1544 bytes
vbaProject_00.bin
9b017f93f614aa957e64e27b661a29f46aad7b328908ae7e39b95ab2d95025c0		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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