Office (OLE) / .XLS malware analysis — malicious · 50871b11ec8d7911

MALICIOUS

Office (OLE) / .XLS

452.0 KB Created: 2020-10-09 09:00:23

MD5: 6cc58d4c333e75476cb43c628aa5906d SHA-1: bc59d906cd07b315075d0b5bbe23a67aa1a44c8e SHA-256: 50871b11ec8d79116e3e61c9e082967e6327e58a7478b92b16cb821ec23dcf79

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The Workbook_Open macro fires upon opening the XLS file, triggering a high-confidence heuristic for CreateObject. This macro executes a PowerShell command that uses 'iwr' (Invoke-WebRequest) to download a file from 'http://rejkabums.ru/wp-content/P3/bin.jpg' and save it as 'C:\Users\Public\Pictures\zjgpvhkhs.exe'. It then executes the downloaded file. The PowerShell command is base64 encoded in the document body, which decodes to the full command string.

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` `f4fa83a27ca3d29471353091eaf7ba5090955173146ea6b1927176ecb9bdd363`	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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