Office (OLE) / .XLS malware analysis — malicious · 47014593d97368b6

MALICIOUS

Office (OLE) / .XLS

135.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: 23cde0022c4f71e4a90e27cfe229a257 SHA-1: 0c6c3cde893904ea1093883d06917d9b73f2ae68 SHA-256: 47014593d97368b6ed063234c8a3df28e7d89ad4abf5a7d5c176d64bf2e66967

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro is triggered upon opening, which uses WScript.Shell to execute a downloaded payload. The script attempts to download a file from 'http://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp_gd4f1b.png' and save it to the USERPROFILE directory as 'fyf/ddnn'. This indicates a downloader functionality, aiming to fetch and execute further malicious content.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
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.
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
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` `1748f5661a0e427609a101abcced43e436f4c106e0065881c2a03f213d1d51f0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	46478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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