Office (OLE) / .XLS malware analysis — malicious · 4c31f34fad2724f9

MALICIOUS

Office (OLE) / .XLS

108.0 KB Created: 2021-09-16 22:13:57 Authoring application: Microsoft Excel

MD5: 303fe9e331166745e53abf66e153dba2 SHA-1: e0487d1082d1bdda055ab89da838c90c0bc0f6a7 SHA-256: 4c31f34fad2724f968f6b34c835f5de3306757ce11e3a0cff8b9c695d85a2bb1

180 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro executes a command to download a second-stage executable from 'http://185.157.160.147:4444/BTconsole3.exe' to 'C:\Users\Public\Documents\Congressparticular.exe'. It then executes the downloaded file. The script also writes the command to 'C:\Users\Public\Documents\ownermention.cmd' and then executes it.

Heuristics 5

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.
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` `8b4afed8e184148bbe40437eb9a9fc562aaa5b06e38cfd7a9ae0130b710c8d74`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1174 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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