Xls.Dropper.EPPlus-9802867-2 Office (OOXML) / .XLSX malware analysis — malicious · ecce5ff9b0aee22f

MALICIOUS

Office (OOXML) / .XLSX

92.6 KB

MD5: 26ed8f8c2caaa78928de13dd17fdb28e SHA-1: c6cf8076d7e8d4a12e67a000e53862270b28178a SHA-256: ecce5ff9b0aee22f086a1177fc0f96df5eedfad9860b8dfb7de7d67285125c68

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 a Workbook_Open macro, indicating that VBA code will execute automatically when the document is opened. This macro is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Dropper' classification and the presence of extracted VBA macros. The embedded URL heuristic also suggests network 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.

Filename	Kind	Source	Size
`macros.bas` `e14680104a3a07770a26a5588e60c4b74ddd3a08b4ea991574785d70cf0687b6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6530 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` `f2d53a76d12c993677e371cca1ce3475da871358503c069b307dcdfbdb2b3183`	vba-project	OOXML VBA project: xl/vbaProject.bin	7168 bytes
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: unlikely

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