Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 27fa7ce70271044c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d1301172895d635cf60a69fe104cc340 SHA-1: c6a4cc44f3e92aea890d4776bb388d75be74511e SHA-256: 27fa7ce70271044c387c75f65c64da595b41d5fe93ed84cc367b98dffb69cd6c
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. The macros reference cmd.exe and PowerShell, indicating an attempt to execute commands. The GetObject call is also a common technique for executing arbitrary code. The VBA code appears to be obfuscated, and its primary purpose is likely to download and execute a second-stage payload.

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
5637ad25a755f20f1b2324ab3bcc65020fe4c5f61acb380538f2bd438951f2b7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
94c4f6bfd5213e5b955235baa3a8d0ec351514f661250c513cb2fd22387b2ecd		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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