Office (OLE) / .XLS malware analysis — malicious · 40ec6278632cd557

MALICIOUS

Office (OLE) / .XLS

50.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: c9c6a2b1c94755b93d6200923889827a SHA-1: 6de6e84b0c47ff3e816f1eea74be33c2b2b88d71 SHA-256: 40ec6278632cd557b1b4a71756f605cd1579e1c54f1534c74f15751199fd521c

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing VBA macros. Critical heuristics indicate the use of WScript.Shell and the Shell() function, which are commonly used to execute arbitrary commands or download and run additional malicious content. The Workbook_Open auto-execution heuristic further suggests the payload is designed to run immediately upon opening the document.

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` `a6b56805132310a769427de281be3f705c1f27bbf47dfe763fa0e04fbea36bec`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12932 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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