Office (OLE) / .XLS malware analysis — malicious · 329c184d59d927d5

MALICIOUS

Office (OLE) / .XLS

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

MD5: 1dffb047bff10de0cadb402073cb8500 SHA-1: cd72722c12eb1113d141759da0e99ab2e2969bf1 SHA-256: 329c184d59d927d5e21853db4a58a961d67b7e76d29c00853cad78b695abeaa4

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the presence of VBA code that utilizes WScript.Shell. The Workbook_Open macro is triggered upon opening the Excel file, and it contains a Shell() call. This suggests the macro's intent is to download and execute a second-stage payload, likely leveraging the WScript.Shell object to achieve this. The specific path 'Templates' is also referenced, which could be used for staging or execution.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `420915cc3006ebe864c2da7d8fce4264da2b95dbaabc2d7539f9e1197d7c2428`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	32626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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