Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c0d69d166f0a855a…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3f8c4e89369f288a98b6b1a78b96012d SHA-1: 4f64e37320ca3d43d6f32a759ab168980b580a88 SHA-256: c0d69d166f0a855a1a5dc83ae5c0f59be04c9beef4aa89c637e22487a6556649
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro also utilizes GetObject and WMI calls to launch a process, indicating an attempt to execute arbitrary code. The presence of a Base64 decoding function suggests obfuscation of malicious commands or URLs.

Heuristics 6

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4752c5b63a4e8bda8c6e00e33d0fecc0a3d10fe042959efc7b48c255e69bc6da		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35153 bytes
vbaProject_00.bin
6833c3adadd7192c863cb90aad267967daa6b3be82b8a22b3322fa7504c8c524		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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