Office (OLE) / .XLS malware analysis — malicious · 44da2dc26f0bc8a7

MALICIOUS

Office (OLE) / .XLS

306.0 KB Created: 2020-10-05 17:10:25

MD5: 6db7cee3bab6308865e92f92f8639078 SHA-1: 69576620812f7f3f3262b8d22d35dadaf32f15a6 SHA-256: 44da2dc26f0bc8a75868505c69330076db931d34ff5c436289d3691912a9ed7a

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 malicious intent. The macro executes a PowerShell command that downloads a file from 'http://45.66.250.101/iT/yKOw0DWydBX6Lp1.jpg' and saves it as 'C:\Users\Public\Documents\byxnnvsac.exe', then executes it. 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` `0862cbdc27f92d3fbbf5752fe9efa6879283563a60f181e614005af1ac7831e8`	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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