Xls.Dropper.EPPlus-9802867-2 — Office (OOXML) malware analysis

Static analysis result for SHA-256 64465474b326c81e…

MALICIOUS

Office (OOXML)

5.2 KB
MD5: 74a22e97cfd1afcd072d2dc2b82f5950 SHA-1: 272df178e759f36827705f9d2a7e6cb765ed9468 SHA-256: 64465474b326c81e01f6e1c63d8453a5b978fa24bdea085283b3a409798c90fa
222 Risk Score

Malware Insights

Xls.Dropper.EPPlus-9802867-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes a command to download a second-stage payload named 'ConsoleApp9.exe' from 'https://serverupload.ddns.net/ConsoleApp9.exe' and save it as 'C:\Users\Public\Documents\YJznzCRNcWhyxHYcXShSLzkDyafpyGObmSmWIqvHhkacBqhbDQ.exe'. It then executes this downloaded file. The VBA code also constructs a batch file named 'C:\Users\Public\Documents\HIwsTwdxLjJWxbLePKVVppzkkAuNawKhTdfUJYWqVbwuFEdEjg.bat' which contains the command to download and execute the payload.

Heuristics 6

  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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 https://serverupload.ddns.net/ConsoleApp9

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d5f50ce1dad7692dc8770ed7b9ee3c661b1377c00ac6efbbe240e4e5355b139a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1962 bytes
vbaProject_00.bin
74063502452757ba442e02527d9d810e5c8e144b204adda85ba54e822aa3ba9b		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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