Office (OLE) / .XLSX malware analysis — malicious · bd91083ce01f04c1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 4214df1ddc5e781bd44ae657284476b9 SHA-1: 4c6e2dca5d80b3c2c6191266e3a07e5d668752d2 SHA-256: bd91083ce01f04c11111c5c33b76552125e1961efbbe15010b1de43349a08843

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Create Volume Data T1071.002 Create Process with ARROW T1105 System Information Discovery T1566 Phishing T1568 Spearphishing Attachment

The file's static analysis reveals a VBA macro that, upon execution, downloads and executes a batch file. This batch file then utilizes PowerShell to establish a reverse shell connection to the external host 212.192.241.94. The `Workbook_Open` macro triggers this malicious activity, and the `CreateObject` call is used to instantiate a shell object for command execution. The extracted URL points to an executable file, likely a payload, which is then executed by the batch file. The overall intent is to establish a remote command execution channel.

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://212.192.241.94/news/IMG_1081007003xls.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `2ef4fa2fcd1cc1df6a17fe00c9e23726e4f26a3ac77b79dfbd9a1829bef20706`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1269 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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