Office (OLE) / .XLS malware analysis — malicious · 02fcea1909693abf

MALICIOUS

Office (OLE) / .XLS

118.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 205ef26465f1de1ef0c95551e0c46858 SHA-1: 514d73271270e7f3c13cbaccf39fca9b3e25c979 SHA-256: 02fcea1909693abf6a1cb489c5f75cb09cfeb7fe46038ee05825e658d42cac75

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The Workbook_Open VBA macro is designed to execute a PowerShell command. This command uses Start-BitTransfer to download a file from the hardcoded URL "http://212.192.241.94/bluehost/IMG_00021017890.exe" and save it as "C:\Users\Public\Documents\themhold.exe". The macro then attempts to execute the downloaded file, indicating a downloader or dropper functionality.

Heuristics 5

Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `a85a77ab49fbf9abec1f454f3d798f5c844fca6f32ad7822d3df7f5d123596a3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1169 bytes

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