Office (OLE) / .XLS malware analysis — malicious · 114415ce27eb6f94

MALICIOUS

Office (OLE) / .XLS

1.06 MB Created: 2021-07-24 09:17:42 Authoring application: Microsoft Excel

MD5: d8d06c97078f654fc2e63cd0554cbfea SHA-1: e3f17abfdb136fb542b9e847a411c2a82585dfd4 SHA-256: 114415ce27eb6f948f2ac16817d359763cba05035b624ec2c6b6f7b390933c57

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing VBA macros. Critical heuristics indicate the use of WScript.Shell and a Shell() call, along with a direct indication of VBA downloading and executing a file via HTTP. The script attempts to download a file from 'http://fyf/ddnn' and save it as 'macros.bas' in the user's profile directory, likely to execute a second-stage payload. The use of WScript.Shell and Shell() calls suggests further execution capabilities.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `532b5ed4777afe39d02b0a70af7aa1a47ea84ac4c0e0ddba35e003d0bb259c23`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	55623 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 long base64-like blob(s).

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