Office (OLE) / .XLS malware analysis — malicious · 230d286d73d5aca0

MALICIOUS

Office (OLE) / .XLS

52.5 KB Created: 2023-02-22 07:56:08 Authoring application: Microsoft Excel First seen: 2023-02-22

MD5: 7f1e9b895c811fc83bc811843128c0a9 SHA-1: 3f42a4c7b226b4dc9fb04e413a34e986b67c6160 SHA-256: 230d286d73d5aca046689681d0ca460864b3fc5aa2d624a8e65838c99e129168

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The VBA script contains references to URLDownloadToFile and WScript.Shell, indicating it is designed to download and execute a second-stage payload. The script attempts to obfuscate the URL by concatenating strings, but the reconstructed URL is 'http://32.20.239.61:115'. This strongly suggests a downloader functionality.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b5fd42c5c704d2992adbadd21efb700764dc1f238891c28874b529b5f776e8f1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2432 bytes

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