Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 a9e5837b05e756d1…

MALICIOUS

Office (OLE) / .XLS

73.5 KB Created: 2022-12-20 09:49:16 First seen: 2022-12-20
MD5: 6e8e5e366a9a619ede6dad9b9e78d523 SHA-1: 1043266a1aba4ab872e09640c00fc0e48c5ed16c SHA-256: a9e5837b05e756d16e599bcac36d6b612a880dd5f8ad2922cdb063987d624581
288 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The XLS file contains VBA macros that utilize WScript.Shell and CreateObject to execute commands. The presence of a Shell() call and WScript.Shell usage strongly suggests the macro is designed to download and run a secondary payload. The ClamAV detection name 'Xls.Downloader.b83ac4c497e169b5-9980307-0' further supports this downloader functionality. The Base64 decoding function and truncated script indicate obfuscation, but the primary intent is clear.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
fb2ae5da213ad2a3d9d56dd0a90b09b4f3ea30b411d30b45df107c97030719c2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4879 bytes

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