Office (OLE) / .XLS malware analysis — malicious · 56d5aebf1d2a5d10

MALICIOUS

Office (OLE) / .XLS

305.5 KB Created: 2020-10-05 16:49:53

MD5: c1f4ab018f443b539208b0f8ecfa24cf SHA-1: 88c914aa132d84010cbc3e41767b04e38d0759ed SHA-256: 56d5aebf1d2a5d1012fc6f056856420586fd370844d17b6c1d9a032ab20af275

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an XLS file containing a Workbook_Open VBA macro. This macro executes a PowerShell command that downloads a file from 'http://45.66.250.101/i/binni.jpg' and saves it as 'C:\Users\Public\Documents\pmfsiystv.exe', then executes the saved file. The PowerShell command is obfuscated within the document body. The use of Workbook_Open and CreateObject indicates a macro-based execution chain designed to download and run 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` `d945e219d29fe3f118385b1a57644f55780321d11556a0637dde7de706bc46dd`	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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