Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 138f956bb99c124c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3a113e3e04ee66d3074dc6569d66c179 SHA-1: a2e747a60d19c2eb5ac5b8194f4e418fb4fadb51 SHA-256: 138f956bb99c124cae08a0d03ca751faf72736c52789edd17704096accc13340
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call is also suspicious. The VBA code appears to be obfuscated, but its likely intent is to download and execute a second-stage payload. The presence of these elements strongly suggests a malicious document designed for payload delivery.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • 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
9b432bd81f85130696c65a6a812a542fd58422b37d60627944c01aabdfe6a83c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
40acf1bb42103e6f7e5d2162edddfcf7ceee403ea53de1e6a92f9572f41756cd		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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