Xls.Malware.Valyria-10029786-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 99101f12bf5a63cb…

MALICIOUS

Office (OLE) / .XLS

119.5 KB Created: 2022-10-11 07:47:39 Authoring application: Microsoft Excel First seen: 2022-10-12
MD5: deb72b056612a234856ffaa123ea4c24 SHA-1: d62063cb6edde883941f3fe2f0dd50cff1a30a31 SHA-256: 99101f12bf5a63cb9a08ccb75fabff8f2b2d7c3b4fccefb0cdef2989103e7b6a
260 Risk Score

Malware Insights

Xls.Malware.Valyria-10029786-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The XLS file contains VBA macros, including Auto_Open and AutoOpen, which are designed to execute automatically when the document is opened. Critical heuristics indicate the use of Shell() calls and p-code execution, strongly suggesting the macros are intended to run arbitrary code. This is consistent with a macro-based downloader that executes a secondary payload.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Malware.Valyria-10029786-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-10029786-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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.
  • 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
c9e776d900c682760da00b1b6500fff97cc27215c40c93da324315c62c521d07		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18770 bytes

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