Office (OLE) / .XLS malware analysis — malicious · 0f8f69d83bf376b8

MALICIOUS

Office (OLE) / .XLS

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

MD5: 8b127a1d3311011559031df875793bde SHA-1: 356984d0005a1a2a5da6a83d74c4e59c7dced037 SHA-256: 0f8f69d83bf376b81b6dc4f2b3babf5d6d9624a3bcb392837d447321dd0994b2

360 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the VBA macros utilize WScript.Shell to execute commands. The OLE_VBA_HTTP_DROP_EXEC heuristic confirms the macro downloads a file from a remote source and saves it to disk, likely for execution. The Workbook_Open macro is a common technique for automatically running malicious code upon opening the Excel file.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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.
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` `09b44c12f1523f922bb7990fea55788ed31b86560128bdc6eb66dcc601617d4c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12561 bytes

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