Office (OLE) / .XLS malware analysis — malicious · fdddb3226bd01d76

MALICIOUS

Office (OLE) / .XLS

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

MD5: bee6719e4eb916c51db0dbc45d1d8c25 SHA-1: be4894b5c6dcde773963752f86e9c5e912102881 SHA-256: fdddb3226bd01d7623ee1e778326b70acb4a4a88f2284d2f8a7a49af7e8c6edf

348 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. Critical heuristics indicate the use of WScript.Shell and a Shell() call, suggesting the macro attempts to execute commands or launch external processes. The presence of a long encoded blob and script execution terms within the extracted macros further supports the conclusion that this file is designed to download and execute a second-stage payload. The exact nature of the payload is not discernible from the provided script excerpt, but the overall pattern is consistent with a macro-based downloader.

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` `e3555e14873d43936936fad4899aec151f62c24a31d8243cc9af886686af4754`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	55737 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 10 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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