hxxp://inmostcases[.]ThischangereflectsrecommendedOCRSuspectpracticeandisOCRSuspectcompatiblewithC99[.]whichrequiresanexplicitreturntypeforOCRSuspecteachfunction[.]SourceOCRSuspectCodeSourcecodeforallprogramsisavailableatknking[.]com/booksOCRSuspect/c2[.]Updates,correc-tions,andnewsaboutthebookcanalsobefoundatthissite[.]AudienceThisOCRSuspectbookisdesignedasaprimaryOCRSuspecttextforOCRSuspectaCcourseOCRSuspectattheundergraduatelevel[.]PreviousprogrammingexperienceinahighOCRSuspect-levellanguageorassemblerishelpfulbutnotOCRSuspectnecessaryforOCRSuspectacomputer-literatereader

Analysis

max time kernel
73s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
18/10/2022, 12:18

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General

Target

http://inmostcases.ThischangereflectsrecommendedOCRSuspectpracticeandisOCRSuspectcompatiblewithC99.whichrequiresanexplicitreturntypeforOCRSuspecteachfunction.SourceOCRSuspectCodeSourcecodeforallprogramsisavailableatknking.com/booksOCRSuspect/c2.Updates,correc-tions,andnewsaboutthebookcanalsobefoundatthissite.AudienceThisOCRSuspectbookisdesignedasaprimaryOCRSuspecttextforOCRSuspectaCcourseOCRSuspectattheundergraduatelevel.PreviousprogrammingexperienceinahighOCRSuspect-levellanguageorassemblerishelpfulbutnotOCRSuspectnecessaryforOCRSuspectacomputer-literatereader

Score

1^/10

Malware Config

Signatures

Modifies Internet Explorer settings 1 TTPs 35 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (data)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb01000000975fab978604b14697eb522259e91a1000000000020000000000106600000001000020000000f6183ccbf97cc9f480c2e48fc7aa74289b75fe6c114bdee81bc07ff10de253b1000000000e8000000002000020000000ae032fda177afe37103876628dcd3f11b12b5b9fd7c9154fd06e73622a27bedf20000000810adb4002ada81ef3847b2d30065d8fe055b89e17f129513f1d7b0791eb019940000000b5a480604c6ff0f65ee0bf81c07e76d46a9f8b20fcdedd179281975cbef9782a248ab739a4b7a0aba81774836fddebf6da9f452ab92b7fbf758e66dbe3b58ea6	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\VersionManager	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 40b2d98dfce2d801	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30991100"	IEXPLORE.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 200ae88dfce2d801	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateHighDateTime = "30991100"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\DomainSuggestion	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateLowDateTime = "2355014855"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLHighDateTime = "50"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "372867675"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\AdminActive\{B7CC6565-4EEF-11ED-89AC-C2DBB15B3A76} = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2355014855"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLLowDateTime = "1251635200"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30991100"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2374860154"	IEXPLORE.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb01000000975fab978604b14697eb522259e91a100000000002000000000010660000000100002000000001176ea70d6479d88e88e95755dd358afba8f623b4d7d511e5dbccecdf06db9e000000000e8000000002000020000000026c639bd614dd00dbf334a73413754fbc098dd8e0a317734ba6f8eb7ba928e320000000b9fa9be0d668dbecff3d1b9a476053787c54a6fe04d839c6d9999b1dfe1a44a8400000009ac24b73a4ee92abcd6e0eec33edb4d94fd4225244f219a6123d8df2626f6e97868b8b4721e02e83e0d5429450b488b5035863fce327fdc2377747782951195d	iexplore.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4956	iexplore.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4956	iexplore.exe

Suspicious use of SetWindowsHookEx 6 IoCs

pid	Process
4956	iexplore.exe
4956	iexplore.exe
4952	IEXPLORE.EXE
4952	IEXPLORE.EXE
4952	IEXPLORE.EXE
4952	IEXPLORE.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4956 wrote to memory of 4952	4956	iexplore.exe	84
PID 4956 wrote to memory of 4952	4956	iexplore.exe	84
PID 4956 wrote to memory of 4952	4956	iexplore.exe	84

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" http://inmostcases.ThischangereflectsrecommendedOCRSuspectpracticeandisOCRSuspectcompatiblewithC99.whichrequiresanexplicitreturntypeforOCRSuspecteachfunction.SourceOCRSuspectCodeSourcecodeforallprogramsisavailableatknking.com/booksOCRSuspect/c2.Updates,correc-tions,andnewsaboutthebookcanalsobefoundatthissite.AudienceThisOCRSuspectbookisdesignedasaprimaryOCRSuspecttextforOCRSuspectaCcourseOCRSuspectattheundergraduatelevel.PreviousprogrammingexperienceinahighOCRSuspect-levellanguageorassemblerishelpfulbutnotOCRSuspectnecessaryforOCRSuspectacomputer-literatereader
1⤵
- Modifies Internet Explorer settings
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4956
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:4956 CREDAT:17410 /prefetch:2
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:4952

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776

Filesize
471B

MD5
460fe13d503bfbb113c3ecee607f5a31

SHA1
52df07ae073bae09b9093fe2c60ccbe7e8dc47cd

SHA256
dfd7a4b3a98874808e3623cf75216dacd47b4389916e0faad7e0ed289743ce0b

SHA512
383f29a13884ec9268eaba1ee47bb73243ec7f4eabdaacaa77bdb2de2b0cde5f000b7ea527179c75cfa30666a06a9333268e06b4cfbef91f4d2b82c119818d23

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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776

Filesize
434B

MD5
1c7d10884a361361d1f6098999d3b132

SHA1
f7f9407e684cda6e45632b2591eedd0ab72743f5

SHA256
bfa28b465ae23a5b13c2931ae3d2d484cf47430d765f41286067a48d0dd913b0

SHA512
20dad6ccef4a7d7fc400101754b6e24ea1a00d5f1349ab02e17925c3e60b771138341bdf5b209d6df51846943f8aa3e21b7bfd388d58222036b4168f791609e7

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