Office (OLE) / .XLS malware analysis — malicious · 8cdd84285c936da4

MALICIOUS

Office (OLE) / .XLS

9.44 MB Created: 2020-04-30 13:56:23 Authoring application: Microsoft Excel First seen: 2022-04-26

MD5: 0895c2181b8a04145b00a395da5b18dc SHA-1: 1a8a0889b55d15e6bbfdc071077e6e880188167c SHA-256: 8cdd84285c936da43cf7c4506b6372a4806b0a90d3db29a72eaa7626dc83896b

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic firings for OLE_VBA_SHELL and OLE_VBA_WSCRIPT, along with the Workbook_Open auto-execution, indicate that this Excel file contains malicious VBA macros. The Workbook_Open subroutine calls Update_data, which likely uses WScript.Shell to execute commands or download additional payloads. No specific family could be identified, but the macro-based execution is a common delivery method.

Heuristics 9

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
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` `5c9f8c988e385359b5f1bd2c0e53dc54aa193524dbe17b344e0dc12acaf06448`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22789 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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