Office (OLE) / .XLS malware analysis — malicious · abce4193160e2d2c

MALICIOUS

Office (OLE) / .XLS

294.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-08

MD5: ef57c08b3059992e4e70a754f973cdad SHA-1: c21e6a563f64aa623228f20671ea12b8e3a567c8 SHA-256: abce4193160e2d2c881403d2290946431b5993bdfee1dabb1205dc4f58cc2d2d

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 Signed Binary Proxy Execution

This XLS file contains VBA macros that are automatically executed upon opening, as indicated by the Workbook_Open event. The macros utilize WScript.Shell to access special folder paths, likely to download and execute a secondary payload. The presence of WScript.Shell and Shell() calls strongly suggests a malicious intent to run arbitrary code.

Heuristics 8

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `23b9cf6d1c8b2650fdd0904eebc4a72a712a52b39293e103b4e329a7305bcbd0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	29422 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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