Office (OLE) / .XLS malware analysis — malicious · e569298451bd12f3

MALICIOUS

Office (OLE) / .XLS

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

MD5: 98136ffd902b60b1107c02cb94fc90e2 SHA-1: ae410c8c5d57fa37b74ff283768bd68c48dd46ae SHA-256: e569298451bd12f37a4c93fb610b254f6237ae89eb3f573427ace46daedd1402

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The critical heuristics indicate the use of WScript.Shell and the Shell() function, suggesting the macro attempts to download and execute a second-stage payload. The presence of these indicators strongly points to a macro-based malware delivery mechanism.

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` `688ac50931a7391b4f35c94ddb1fb0a904578495d43bfdc98f461bca93c893b6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12870 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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