Office (OLE) / .XLS malware analysis — malicious · fd1d2de482925060

MALICIOUS

Office (OLE) / .XLS

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

MD5: b7aad8bde1b9be20a2e92763eec1ca9d SHA-1: e787be2b75a336366b4fba085d2c3e7225b9b7a5 SHA-256: fd1d2de482925060b31bf7aed80909ff2c8f4a5bfa61f8679e70d5670e9bb67e

408 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell to execute commands. The Workbook_Open macro is present, suggesting automatic execution upon opening the Excel file. The script attempts to download a payload from 'fyfgjhgjdh/dddhshnn' and save it to the user's profile directory as 'fyf/nppghynkcodnkgeihgetigjpu', likely to execute a second-stage payload. The ClamAV detection further supports its malicious nature.

Heuristics 10

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
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` `c670474008f593347cbf0bb688c3bba9bdca108c100f599d842efdc025104d07`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	60815 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 142 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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