Office (OLE) / .XLS malware analysis — malicious · 35002c596375385d

MALICIOUS

Office (OLE) / .XLS

306.0 KB Created: 2020-10-05 17:24:38

MD5: 0790a1adfdf722900b54c7ad47863176 SHA-1: af15a6af3f18e51e0a120744273fd7d317a5458d SHA-256: 35002c596375385dd78d903f1df0ec36f04977b30907f29f3adc5a40617b08bd

140 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro fires automatically when the spreadsheet is opened, indicating a malicious intent. The macro executes a PowerShell command that downloads a file from 'http://45.66.250.101/iT/DFI-60177.jpg' and saves it as 'C:\Users\Public\Documents\yedwwpshn.exe', then executes the downloaded file. This indicates the sample is a downloader for a second-stage payload.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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` `35aa4f5081a4c226a9c1a47b07dfe29dfa45a3d981f6461b980c8ce2d13346cb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1259 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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