Office (OLE) / .XLS malware analysis — malicious · b98ed0b56caabd2a

MALICIOUS

Office (OLE) / .XLS

153.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-01

MD5: ae4d8c9d03682e8c7fabc1d0f3b18e96 SHA-1: 40fdeeb56c59d14237d32c8b6aafabf4286afb2d SHA-256: b98ed0b56caabd2a859387bb9d999a0b179708869014bedd5f679a0494df1c66

348 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 use of WScript.Shell to execute commands. The Workbook_Open macro (OLE_VBA_WBOPEN) is automatically triggered upon opening the workbook, suggesting an immediate execution of the malicious payload. The script appears to be heavily obfuscated, but the presence of WScript.Shell and Shell() calls strongly suggests the download and execution of a second-stage payload. The specific obfuscated string reconstruction is not possible due to truncation.

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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `95420a9cf6a2b22ed28c3cfd00eb668a704fac403af455a33ad4070e6e298a24`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	46391 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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