Office (OLE) / .XLS malware analysis — malicious · 126a6947bb766d06

MALICIOUS

Office (OLE) / .XLS

143.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-07-22

MD5: 1f2d6c9751010248d60b97e48b805f33 SHA-1: aa7ede644f6580b44af5437275a11ad022651cc5 SHA-256: 126a6947bb766d06e7f1eb176b6fa573e72c72dd0f705a99df1e335b7839b134

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 file. This is a common pattern for macro-based malware droppers. The VBA code explicitly references WScript.Shell and performs an HTTP download and save operation, strongly suggesting the intent to fetch and run a secondary payload.

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` `9165dc2a0f69ee4fab4e8d0bd1222b070a900eb790d48f59a67717a622bdd66b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12823 bytes

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