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

Static analysis result for SHA-256 084815d6dbfd3b18…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-15
MD5: 830599af5122bafd880258b4251384f2 SHA-1: 8edafcc60ea27932d5c91fa766563892e34dcdd1 SHA-256: 084815d6dbfd3b18c4e79da980ee09a8409a3f44c271585905e01410937e9dcb
342 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: Malicious File 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://185.246.220.65/ifi/Xomxrbym.exe using certutil.exe and then executes the downloaded file. This indicates a dropper functionality, consistent with the ClamAV detection name Xls.Dropper.EPPlus-9802867-2.

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://185.246.220.65/ifi/Xomxrbym.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9c48483554fe9d3e36ce192ed38945d1d0f8317c58a80a0d4907397240ae5eb7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1115 bytes
vbaProject_00.bin
4853b6ee4a93c14b40ca01208d82405ab882d191667f54f591c3df78d458828b		 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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