Office (OLE) / .XLS malware analysis — malicious · 5df812e1d7fa82b2

MALICIOUS

Office (OLE) / .XLS

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

MD5: b8dcc352dca07f877e0060ff83ca4449 SHA-1: 366e7e0392152eb4dd5ed7907d4f9b7099fb7dc9 SHA-256: 5df812e1d7fa82b2d43bf7f02bc8b86195774c8eb85dbcd22d61a38381e42c29

490 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter T1204.002 Malicious File

This Excel file contains a Workbook_Open VBA macro that is heavily obfuscated and uses WScript.Shell to execute commands. The macro is designed to download a second-stage payload from a hardcoded URL and save it as 'macros.bas' in the user's profile directory, which is then likely executed. This indicates a downloader or droppper functionality.

Heuristics 12

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.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Xls.Malware.Valyria-10032137-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032137-0
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` `96a3b1d3baa7260830332b783e256f759140d54b169e7d81b241bc14f6fe3b14`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	58052 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 127 long base64-like blob(s).

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