Office (OLE) / .XLS malware analysis — malicious · 78cb7075638bf76e

MALICIOUS

Office (OLE) / .XLS

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

MD5: 149475cffdd74071c94afc576956d8fd SHA-1: ffa9a0984a5f1be5b6637a6b89c9fef1c1948de3 SHA-256: 78cb7075638bf76eb74cfa7bc724c38965e68ea04914f3830d90e77decc11573

360 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLS file contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to download and execute a second-stage payload. The critical heuristics OLE_VBA_SHELL, OLE_VBA_WSCRIPT, and OLE_VBA_HTTP_DROP_EXEC strongly indicate this malicious behavior. The script's intent is to download and execute an external payload, which is a common technique for malware delivery.

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` `860bddd70b22a2fcf37caabb449a724535af4b6d052623a4366247e749559a18`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	39490 bytes

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