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

Static analysis result for SHA-256 94abf64f20c01859…

MALICIOUS

Office (OOXML) / .XLSX

5.8 KB
MD5: 9a8b33afa3197696b6b8fe1bb448b61f SHA-1: 1df9872934091b104c2365914b27fb51c008fc1e SHA-256: 94abf64f20c01859317ff6eaffce2727ba25d4ade9b4c26002e3dc652aba3ef8
260 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Xls.Dropper.EPPlus-9802867-2. Static analysis revealed the presence of a Workbook_Open macro, which is a common technique for automatically executing malicious code upon opening the document. The macro likely uses CreateObject to initiate the execution of the embedded 'macros.bas' artifact, serving as a dropper for further malicious activity.

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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
354248cf4451a4cf4042bef751dd418ddd9661dd6c6ee4c3dff1d7d9f4e3651d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3316 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
3767beefab299fba4be7522db80a099d9fde253fc4726a86860aa7de08ca2504		 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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