Sload — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 b825e4195f25bf77…

MALICIOUS

Office (OOXML) / .XLSM

81.0 KB Created: 2020-06-05 11:49:48 UTC Authoring application: Microsoft Excel 16.0300
MD5: 02619a571241ae32d86da6b45715f7b1 SHA-1: cc9b7d744034472de09151add0c6c797b68d9e54 SHA-256: b825e4195f25bf77c866948f7e256bf271a076073e6a9d1187fbeeef83185ca0
260 Risk Score

Malware Insights

Sload · confidence 95%

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

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. ClamAV signatures identify it as 'Sload', a known malware family. The presence of a Workbook_Open macro and the ClamAV detection strongly suggest that the VBA code within this document is designed to download and execute a secondary payload. The heuristic 'OLE_VBA_CREATEOBJ' further supports the execution of arbitrary code.

Heuristics 7

  • ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
  • 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
  • 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://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
11e6da8bf9100a7855d701820b2699b11dd98b639a5b12422390a6a7a71df06d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2639 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
3cfc265ac8f681257e3e654e8dce762696ecd3872996f067358d9f3738c44744		 vba-project OOXML VBA project: xl/vbaProject.bin 15872 bytes
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.