Office (OLE) / .XLS malware analysis — malicious · ffdd3fcf1f82df7f

MALICIOUS

Office (OLE) / .XLS

38.5 KB Created: 2021-09-22 22:32:46 Authoring application: Microsoft Excel

MD5: fe3fc9347e54750c6f9dde7ad2f6ab4a SHA-1: a326257769cbe5442d9cc2e340616f2d72588898 SHA-256: ffdd3fcf1f82df7f8ee973d826182cb12feafc1a738eb0c398e881dda8873956

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1218.011 System Binary Proxy Execution: Rundll32

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell. The Workbook_Open macro is designed to execute arbitrary commands. The script attempts to reconstruct a command string, likely for downloading and executing a secondary payload, which is a common initial access technique. The exact command string is truncated, but the intent is clear.

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` `9476bbf5f23a44976bb085cca224f5fdbee2be94b6e194fe18ba53dbe307264b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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