Xls.Dropper.EPPlus-9802867-2 Office (OOXML) / .XLSM malware analysis — malicious · dd07e4b225894da8

MALICIOUS

Office (OOXML) / .XLSM

92.6 KB

MD5: d89a828241cd67ebdc96a905e5924f24 SHA-1: 90ef404e139164b266d553a5e094b01c0e810b4f SHA-256: dd07e4b225894da846f284566118ccc96a2aabca90c24337f36ddcc7066eeef4

260 Risk Score

Malware Insights

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

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an XLSM document containing a Workbook_Open macro, a common technique for executing malicious code upon opening. Heuristics indicate VBA macro obfuscation and the presence of an embedded artifact. ClamAV detection confirms this is a known dropper family, Xls.Dropper.EPPlus-9802867-2. The macro likely downloads and executes a second-stage payload, as suggested by the dropper classification and obfuscated VBA code.

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` `e89c306c0f4d3a9a60d3ae18c9949212ca57192cf61f6a196e7d309eb9635504`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 21 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `142317b73c3b03c9c99bb1a79588fb3ceda1cdd81a8920b68d50fb2008821f73`	vba-project	OOXML VBA project: xl/vbaProject.bin	6656 bytes
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: unlikely

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