Office (OLE) / .XLS malware analysis — malicious · 7c9fba2bb2a7fa8c

MALICIOUS

Office (OLE) / .XLS

365.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-22

MD5: 71ede79f32ec5e86632c339361266bec SHA-1: 7ef72908f6bdc9ca834c5aa24d2ee3e375dfda86 SHA-256: 7c9fba2bb2a7fa8c3e8b9f6b88c2faf53eec64d939c914e44544146091467e9f

400 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro is configured to execute arbitrary code using WScript.Shell. This is a common technique for downloading and executing a second-stage payload. The heuristic firings strongly indicate malicious VBA macro activity, including the use of Shell() and WScript.Shell.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
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.
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` `389dae8ecd71602689075cf122427c8c0fc2d7fe73fb6d5487a1302b04511997`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18623 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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