Office (OLE) / .XLS malware analysis — malicious · 15eadb2084916e52

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-08-15

MD5: 5099f03f54b9d67a98422de8a62d60e7 SHA-1: d9132f2c3208b3d1dfadfa6765f473477452a7fb SHA-256: 15eadb2084916e52c48f9bc8e4166e613c8cc03843915dcc200a42ed0469f817

360 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell, a common technique for executing commands and downloading payloads. The OLE_VBA_HTTP_DROP_EXEC heuristic confirms that the VBA code attempts to download a file from the internet and save it to disk, likely for execution. The Workbook_Open macro is a common auto-execution vector for malicious Office documents.

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` `164e87441a66f9a1f43d57d6d48f5073a214629f4388280e11f7af18b26a5871`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13420 bytes

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