Office (OLE) / .XLS malware analysis — malicious · ba947c916333c85a

MALICIOUS

Office (OLE) / .XLS

105.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 4ab37b3434adaaef125d6e4ffe2dce59 SHA-1: 2d43fb2980c05c6bbc077d0e9b8be72d98d43e3c SHA-256: ba947c916333c85af751309f177676bfb3b2923a631ccd335bea0f731022a6f8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Command Execution T1566.001 Phishing T1071.002 Application Layer Relative File Path T1027.001 Obfuscated Files or Information

The analysis reveals a macro-based delivery mechanism, specifically a `Workbook_Open` macro that utilizes `CreateObject` to instantiate an Outlook application and execute a command via a URL. This command downloads a file (likely a secondary payload) to the C: emp directory. The use of `CreateObject` with `Outlook.Application` and `WScript.Shell` suggests a common tactic for establishing a reverse shell or executing arbitrary commands. The URL points to a server that likely hosts the malicious payload. The presence of obfuscated VBA code further indicates an attempt to evade detection.

Heuristics 6

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://209.141.61.124/Q-2/d234.ex

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f160c131d6195938443629b3adf0d87d0133a8b172df2e014b0624ba9a018421`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1254 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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