Office (OLE) / .XLS malware analysis — malicious · 75f423b4e6ca17c9

MALICIOUS

Office (OLE) / .XLS

143.0 KB Created: 2021-07-24 09:17:42 Authoring application: Microsoft Excel

MD5: e0f53bee25d377088bd3ec927c86b10f SHA-1: e2c705f99df3ec3a2afb4946f7dcb7b7be459a83 SHA-256: 75f423b4e6ca17c94dda8104d745642ca61a0a54a38bf29e3ca55b9d0fec7d66

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that utilizes WScript.Shell to download a file from the URL 'http://fyf.ddnn/fyf/nppghynkcodnkgeihgetigjpusqD0og5oskhks1111nuqpujuvusgehethg0npd/tbojeobspudbsu' and save it as 'macros.bas' in the user's profile directory. This indicates a clear intent to download and execute a second-stage payload, likely leading to further malicious activity.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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.
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)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9b25db0cf073cc6513f19acadfd334f399f137435550e296d940164b6a280bc7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	45643 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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