Office (OLE) / .XLS malware analysis — malicious · 073c849de2f3eb0e

MALICIOUS

Office (OLE) / .XLS

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

MD5: 7463296b9d2fc3f89eae0cbce0898521 SHA-1: c1de4ce57bbc97ef0261b2833345664f4f3e8a08 SHA-256: 073c849de2f3eb0e5472de2e840832d9bedb9b339ee5fe31788fea511c88c94f

360 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristics indicate the presence of a Workbook_Open macro that utilizes WScript.Shell to download and execute a second-stage payload. The VBA code explicitly uses `CreateObject("WScript.Shell")` and `Shell()` calls, confirming its intent to execute external code. While the specific download URL is truncated, the overall pattern suggests a macro-based downloader.

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` `cd862f067724172a001efb1aec4bca43bc6703b0a083d0f323343428fa359df0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	31254 bytes

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