Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f9633dff43c28354…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7020c5788d24450e3342d20e849bf0b4 SHA-1: 564d74a53668ad531993d3ff051f00d855c53525 SHA-256: f9633dff43c28354052ff790db6cadf579c5ebbe4972feccea428e6a2447c8d0
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 and the presence of VBA macros suggest an attempt to execute arbitrary code. The script's functionality appears to be base64 decoding, which is often used to obfuscate malicious payloads. The primary goal is likely to download and execute a secondary 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
d2499b9945544d13212bf121d297e7fece843bcb57ef53fba9c749ff91b00079		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
17d0c5afa6f9ec02483506c528750e325b5258f5f930b575b49f0ac38c29a01c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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