Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 223ed06abcf60462…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b0ca3e35a7babf159eddaf200b3c035e SHA-1: d782c265c57108ca84a1fdb30cb96917c9654f34 SHA-256: 223ed06abcf60462d02db3997f62892e0ba1818c4e5f6eeb93e232beed8fb3bb
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to decode and execute a payload. The VBA code is heavily obfuscated, but the intent appears to be to download and run a second-stage malicious file.

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
065c17d717fa7de001fa81075f685c9aff5cbbf9b53f78ad972ac0f0c60dbe73		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
8909e9c58a19e3085e296031568079c416d1c885cfaca7010eede8eec1fa5949		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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