Office (OLE) / .XLS malware analysis — malicious · d29dc91be987c94a

MALICIOUS

Office (OLE) / .XLS

452.0 KB Created: 2020-10-05 07:07:30

MD5: d7f2c03757d0a2b5f19a70acedc0c2a4 SHA-1: c956a33d515eae366491ada96330f635159c9b77 SHA-256: d29dc91be987c94a08e4eeb24fa8018826a052978e3e0725f18d64bd1ba99a9d

140 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro fires automatically upon opening the XLS file. It contains a PowerShell command that uses 'iwr' (Invoke-WebRequest) to download a file from 'http://45.66.250.101/iT/PSI-0018.jpg' and saves it as 'C:\Users\Public\Documents\ixnvukmxu.exe'. Subsequently, it executes the downloaded file. This indicates a downloader functionality, aiming to fetch 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` `7ba110b63a4323e43cdb68b7fc65328698a94eafbe866d3a9a65007bc2b01a1e`	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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