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

Static analysis result for SHA-256 dcbcdca874fa56a4…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-21
MD5: 7ebdf90e9c2b2dc740b5a930aaae9c55 SHA-1: 1387b0f912d54f9528665dba4889daac9abae2e8 SHA-256: dcbcdca874fa56a439e396a29375b40b3d5774029ad62a841878d9783bf01143
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The Workbook_Open macro executes a command using cmd.exe to download a file from http://54.249.210.44/xi/loader/uploads/MT-07610135.exe using certutil.exe and then executes the downloaded file. This indicates the sample is a dropper designed to fetch and run a secondary payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://54.249.210.44/xi/loader/uploads/MT-07610135.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
035ac04c6c993f779da4aed29b9a4d1242c67d20cb5ad538593ee2670da83012		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1131 bytes
vbaProject_00.bin
80c5137731c1405791b584f6a489132d4ead50067f00b50fd184c0043489ffa4		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.