Qbot — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 e9ab22489bd5d3bf…

MALICIOUS

Office (OLE) / .XLS

537.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e56bba7a608666ba627bb97cd84b9c59 SHA-1: e7e0a8f4fc9dad3963eaf7063fb7f5cdb17ffb2f SHA-256: e9ab22489bd5d3bfbdf73ec47d70059db6ea06ae135014f931f1435d803e0ecf
160 Risk Score

Malware Insights

Qbot · confidence 85%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 User Execution: Malicious File

The sample is a malicious Excel file with VBA macros. A ClamAV detection specifically identifies it as Xls.Downloader.Qbot. The extracted script contains obfuscated string concatenation to build commands such as 'regsvr32' and '-silent', which is typical of Qbot's delivery mechanism to execute a second-stage payload via a LOLBin. a

Heuristics 4

  • ClamAV: Xls.Downloader.Qbot-b760f03263b7c21b-9950248-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Qbot-b760f03263b7c21b-9950248-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
82e1e47d5ead737b15bb2148da65cf727043b2c8a73a6e4133c451f98570a39a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3700 bytes

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