Office (OLE) / .XLS malware analysis — malicious · ecc192b51f189d8a

MALICIOUS

Office (OLE) / .XLS

53.5 KB Created: 2025-09-26 11:33:59 Authoring application: Microsoft Excel

MD5: 4c51c3e650967d639ce90aae3151d85f SHA-1: b5c85526d85d4ecd4c2da402e5a98ebeda8a9245 SHA-256: ecc192b51f189d8a835a5d869b16446dedcfc6724843144b3b249d61be9460c5

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is configured to execute a shell command using WScript.Shell. This is a common technique for downloading and executing additional malicious payloads. The presence of WScript.Shell and Shell() calls strongly indicates this behavior. No specific family could be identified.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9a65a5b728eb8c6c4963d912259ed86bcb462bc3dcc9a7156b263936e22f7c96`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	28262 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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