Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d33e9e4958a9ddfb…

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 300e32b14b53fecdf90ddf820afc8c8b SHA-1: 9170dbc037570b5508b500c50991a192bfb17902 SHA-256: d33e9e4958a9ddfb94c7f0f7a768b1bb8ce554c42ef01cc4be393492ad8afea6
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This OOXML document contains a Workbook_Open VBA macro that references PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_WMI_PROCESS_CREATE' indicates the macro uses WMI to launch a process. This suggests the macro is designed to download and execute a second-stage payload, a common technique for malware delivery.

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
5c1151d9f1dd478670b5055cb8a3e60b79d713bb5ae59f71a0b2aecb092ae8d2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35182 bytes
vbaProject_00.bin
d67040541d51875b8458dbe1c92dba891f36ecfb7b8b7e66d099404bfcd20e60		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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