Office (OLE) / .XLS malware analysis — malicious · 9612708ef4b940e0

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2021-03-05 06:43:07 Authoring application: Microsoft Excel

MD5: f04d756b77af9611fed9eb5317fd665f SHA-1: c5859b140433b8aa8a707fee87b72ef8f6c75a3b SHA-256: 9612708ef4b940e094d1fac3f0ffb1055004d013dbbe337193ccc0d8c12cb8fa

360 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The critical heuristics OLE_VBA_SHELL and OLE_VBA_WSCRIPT indicate the VBA macro uses WScript.Shell to execute commands. The Workbook_Open macro (OLE_VBA_WBOPEN, OLE_VBA_PCODE_AUTOEXEC_EXEC) is automatically executed upon opening the document. The SE_ENABLE_LURE heuristic confirms the document prompts the user to enable content, a common social engineering tactic. The macro likely downloads and executes a second-stage payload, as suggested by the 'Shell() call in VBA' and 'Suspicious extracted artifact' heuristics.

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7e2e41b84c027ebde466bd689b2d12e2cb4b236ebf728b864f86eae845d705a4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 69 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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