Sload — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 31720bfa26640d3d…

MALICIOUS

Office (OOXML) / .XLSM

16.5 KB Created: 2021-02-23 19:41:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: e10c067bb6b61c4978eb54090c46bc67 SHA-1: 7df9542ca29c4e7a5d2386857f580d63e2e841b5 SHA-256: 31720bfa26640d3d2c7fe49b544596264d1886be023d62dcf0ffed3566c3ef81
308 Risk Score

Malware Insights

Sload · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an XLSM document containing a Workbook_Open macro, which is a common technique for executing malicious code automatically. Heuristics indicate the use of CreateObject and GetObject, suggesting the script likely manipulates the system or downloads additional payloads. ClamAV detections confirm this is the Sload family, known for its macro-based delivery and payload execution.

Heuristics 9

  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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
ed02d11f588534f23f6dada1418db6a86854a8596e39a2dde380944b171f824e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3878 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
72f6b89a65420fa943ab3c10d8a1c14c95dfaafa8edf7b7cb0014c6345b2859a		 vba-project OOXML VBA project: xl/vbaProject.bin 22528 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.

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