Office (OLE) / .XLSX malware analysis — malicious · fd23cea94ed4021b

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: a6b4583e288ae0c44bce747e3f87b1c6 SHA-1: e5518168d4d40ba8681d226b5710ff8bc7b3b6bd SHA-256: fd23cea94ed4021bce76ce5c3685aecf80b219a620df56061bb4c65f17227a54

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Workbook_Open event, which is a common technique for initial execution. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighthilivercrafters.com/store/wBjNOUwc/B110N4cQ6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and saves them as 'oue4hjld.vbs' and 'bhnasleil.bat' in the 'c:\programdata\' directory. The script also uses obfuscated commands to achieve this, indicating a downloader functionality.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `14c2bd38e59bad2e2f2c5fb24be211e53374804d47662e9dc97dde74575acbb4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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