Office (OLE) / .XLS malware analysis — malicious · e473430b594bd9e7

MALICIOUS

Office (OLE) / .XLS

6.11 MB Created: 2025-08-07 20:13:42 Authoring application: Microsoft Excel

MD5: 9ae01a595d8d2892ee2b4407b9df6bcd SHA-1: 9eba381b4a774c62f431d08b0955c870d87dd752 SHA-256: e473430b594bd9e767ea7687914ed690cd72ad926ce865d68540614c8ad18f56

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information

The critical OLE_VBA_SHELL and OLE_VBA_BASE64_SHELL_COMMAND_STAGER heuristics indicate that the Workbook_Open macro is designed to execute a decoded shell command. This command likely serves as a stager to download and execute a further payload. The presence of a large VBA macro and the auto-execution trigger via Workbook_Open are common techniques for initial payload delivery.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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.

Filename	Kind	Source	Size
`macros.bas` `145bd7203c9c6ebc707c888948b8c76183a0055d8608228ecdd15d973f0087e7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4912341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3044 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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