Sload — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 1c2dd1f4b40bdaad…

MALICIOUS

Office (OLE) / .XLS

38.0 KB Created: 2022-04-11 09:34:32 Authoring application: Microsoft Excel First seen: 2022-04-11
MD5: eba0e4348aec7d3cfdc0a8d6ae01d2c0 SHA-1: e0df1d0e24214439c1f6b4574835d1865fc4e7b3 SHA-256: 1c2dd1f4b40bdaad4a9b2893b5b4f4a45328378fe4cd5866c16d1bdd7891881c
288 Risk Score

Malware Insights

Sload · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.001 PowerShell

The Workbook_Open macro automatically executes a VBA function that downloads a file from 'https://transfer.sh/BfidrY/Frank.exe' and saves it to the user's temporary directory as 'dropped.exe'. The downloaded file is then executed. The ClamAV signature 'Xls.Malware.Sload-7135989-0' and the VBA auto-execution heuristics strongly indicate the Sload family.

Heuristics 8

  • ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
  • 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
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6a6247c7d6ec302899445031aff2c9aa6aee31fc7bd95ffd667df731b2f01413		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4454 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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