Office (OLE) / .XLSX malware analysis — malicious · 403b0545dc3a142d

MALICIOUS

Office (OLE) / .XLSX

106.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-06-09

MD5: 7ac9e24858f16302bdb572b99793ca84 SHA-1: 0a4cff7adac926fa12d95aa2bfc0e56b4883581d SHA-256: 403b0545dc3a142d410b5a568174bc03b08df6808a7a8de5f98bea7b49d95a5b

302 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The VBA script within the Excel file utilizes `CreateObject("InternetExplorer.Application")` to navigate to and download content from `http://192.210.149.242/mac.txt`. Subsequently, it uses `CreateObject("Wscript.shell")` to execute the downloaded content, indicating a downloader functionality. The ClamAV detection as 'Xls.Downloader.Remcos' further supports this assessment.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
ClamAV: Xls.Downloader.Remcos-ffff7e420001049f-9951592-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Remcos-ffff7e420001049f-9951592-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.
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://192.210.149.242/mac.txt

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a6d8437e7aaa6c271104268c8c6c55c36feddd4d04ae9e4c0537e8b6f7b6df43`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1156 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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