Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 6cee2b6d5988a7e8…

MALICIOUS

Office (OOXML) / .XLSM

112.5 KB Created: 2020-06-29 07:17:33 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8a7a042bda4aaa7ce8cf294649520b91 SHA-1: add0cea47b02680edc253e9967a5e2f2a6208604 SHA-256: 6cee2b6d5988a7e8d7b9484759dd8e6c5d0ff10f4637ea3a7e7bb1c4daddf201
300 Risk Score

Malware Insights

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

This XLSM file contains VBA macros that leverage WScript.Shell to execute a command. The macro's 'golf' subroutine constructs a string and then uses WScript.Shell to run it. The 'date1_Layout' subroutine processes constants from the active sheet, joins them into a single string, and passes this to 'golf'. This indicates the file is designed to download and execute a secondary payload.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Dropper.Agent-8456013-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8456013-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ddef8e9eff06024985785a745eeed102d16def43afbcd936c9c3bbec48993fa1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1195 bytes
vbaProject_00.bin
a32e0dcea7d10e373e5a4d61b21e2ada795779d9b76f0d4b95a8b8b121caacf2		 vba-project OOXML VBA project: xl/vbaProject.bin 15872 bytes
Detection
ClamAV: Xls.Dropper.Agent-8456013-0
Obfuscation or payload: unlikely
emf_00.emf
76f287b1e3251b7e0e5ba27bfb05b35831150cc665de00f9fd2d807e2d2a028d		 ooxml-emf OOXML EMF part: xl/media/image1.emf 1976 bytes

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