Analysis
-
max time kernel
134s -
max time network
132s -
platform
windows7_x64 -
resource
win7-20230831-en -
resource tags
arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system -
submitted
14-09-2023 16:18
Static task
static1
Behavioral task
behavioral1
Sample
1b51293002041bfee9c8daba4eda7fe5b4678ef1b9ee693cced004400bf01d64.apk
Resource
android-x86-arm-20230831-en
Behavioral task
behavioral2
Sample
1b51293002041bfee9c8daba4eda7fe5b4678ef1b9ee693cced004400bf01d64.apk
Resource
android-x64-20230831-en
Behavioral task
behavioral3
Sample
1b51293002041bfee9c8daba4eda7fe5b4678ef1b9ee693cced004400bf01d64.apk
Resource
android-x64-arm64-20230831-en
Behavioral task
behavioral4
Sample
HM_JsBridge.js
Resource
win7-20230831-en
Behavioral task
behavioral5
Sample
HM_JsBridge.js
Resource
win10v2004-20230831-en
Behavioral task
behavioral6
Sample
consentform.html
Resource
win7-20230831-en
Behavioral task
behavioral7
Sample
consentform.html
Resource
win10v2004-20230831-en
General
-
Target
consentform.html
-
Size
27KB
-
MD5
7a2ed1a6df8839dd8936a86d9edccabe
-
SHA1
7bc1af528444afca678905059cb1ba9fade65352
-
SHA256
d02fbd55c1b5da3fa1f77c52f5633421395a3bf228457521512b37cdacd65f9c
-
SHA512
ea0c3e512b37e340f4c0a49196344f1dd5aef38c469ba124605518e913be601a5b6a92a50f00e962bc90041bb80e51480254c7902032d894b7d24be5aec47097
-
SSDEEP
768:wEh4FOT6bJdK0D7fkvaqF1b6cY4c5rC28c54NTc5Jt:th44GbJdKoncY4c5Wc5wc57
Malware Config
Signatures
-
description ioc Process Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1" iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 309fda3927e7d901 iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\MFV = 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 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\InternetRegistry iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "1" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\SearchScopes\DownloadRetries = "3" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\IETld\LowMic iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\LowRegistry iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "400870200" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{647461E1-531A-11EE-9EC9-FAA3B8E0C052} = "0" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\SearchScopes iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb010000002bccc567d90a0b479b49b1b2d43318c3000000000200000000001066000000010000200000000a855d38537fef1baef6fdb97e25e4c65d82e6178e40aa1c0a4b38900858b2f4000000000e8000000002000020000000aa35ad1fefec145d6d92dba9da35af9472b93dc43f21eb3b25b65908a6e0313c20000000aad8fee3ebad72e08e4f92ee4cdd1e1061ea901245b3ac634a437eefea7af1d0400000003e32724a7970eaabd363b62731bfba44de4b6b1754df940fa913679889d8b35c87f95dfcbac51a29c98150e4df8074af583ff66dcb7876f5e887e429632b7696 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\GPU iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\PageSetup iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Toolbar iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Zoom iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\Main iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\IntelliForms iexplore.exe Key created \REGISTRY\USER\S-1-5-21-607259312-1573743425-2763420908-1000\Software\Microsoft\Internet Explorer\DomainSuggestion iexplore.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 1880 iexplore.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 1880 iexplore.exe -
Suspicious use of SetWindowsHookEx 6 IoCs
pid Process 1880 iexplore.exe 1880 iexplore.exe 3016 IEXPLORE.EXE 3016 IEXPLORE.EXE 3016 IEXPLORE.EXE 3016 IEXPLORE.EXE -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 1880 wrote to memory of 3016 1880 iexplore.exe 28 PID 1880 wrote to memory of 3016 1880 iexplore.exe 28 PID 1880 wrote to memory of 3016 1880 iexplore.exe 28 PID 1880 wrote to memory of 3016 1880 iexplore.exe 28
Processes
-
C:\Program Files\Internet Explorer\iexplore.exe"C:\Program Files\Internet Explorer\iexplore.exe" C:\Users\Admin\AppData\Local\Temp\consentform.html1⤵
- Modifies Internet Explorer settings
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1880 -
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1880 CREDAT:275457 /prefetch:22⤵
- Modifies Internet Explorer settings
- Suspicious use of SetWindowsHookEx
PID:3016
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5aee1f44502210af2826d2239c4414de6
SHA186bcf1298f2001e7e3d5836f534a3d66b98bfcc0
SHA25661954f70052796494c3d349e49fe5b958241e148cba9303cf7c277536de2acad
SHA512ed4a54ca968f1ee33cac4545fcc91396f8a68c5beb93d1033399086d4fc76602ebe69655948c2799d54edb0f37b246759e1d57a88399ce74dd524601e38d1dba
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5f12831b350081509690a5ce68316242e
SHA1a7033596594dfdc8c79d1828a2325eae91adb6c9
SHA256a238a504c822ad4c9ff3dc049262cd1e813d3b3d54aa692c573d5a7bbf17eb9b
SHA512adf9d5d4b3322bfb9f776221b2d30341f5db3e13899fb66c2ea63bcfd967cc43fe8e662764b8703f58d3ce268a0b6e361e84f736ef11ff09ec78b42de95914cc
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD55285c16940d0b32bde3a6b13828d6e8e
SHA161884aa7400bae84cb475b5dda2cf80e6cc6aad4
SHA256424b71a0bc396c3fbc3db21f62ddc3bb8e594edac785d3f94b55622e788b2ee3
SHA512ed1a07b1f478146160c3b266277c90052f20343fb4b21a5501b8ed0e0f0bb720e0d24578fb9954b9eaa1ee70e07b49c89edeac994ab1e8e8939fba5f3338972a
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD55dff800ec03a4914c0e831fa2ad1cc18
SHA1d8a75e0d85b723f45f719b8f6749d8716aecf0e0
SHA256c79555d60e91d4707836633578e4de79cad142209e3f37bca1ec54f0243fb515
SHA51290aa376f73e30325347fd3d7242de6c569d5cf6dab373311b929628b3b957724c610c580a7acd739a214a2dc9ee0c6105f25d335a4683d61b6b5c0af0bda40ce
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD541e8df462c7dcbcdb53b2843b5754b98
SHA1a12f086d817090cd26da8fc4d685fc92faf1af3b
SHA256490781450e237bc799fcb3853c5a4e32d00e981115904ffa080d1b2d619a1a69
SHA512e89b18a32beddd0de0218156953c83a9272f5d02442e14743f63d6da5932cd4e6277781995ea3f4d5eec32b6abd89cd1e49e460fd24da4d3abbb5da1d1ad0e47
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5792ae23a014f601dc5ee51e8c7a8b619
SHA1d67c1b713bd002a15da9165a4b055029d6e3531b
SHA25626e4bada1f29663bacfced8def97fd56fc8c4f99bcf285bdd3e5c63007e79e55
SHA512c43b7f4fb372782dd222992c205a877c6ee2aea7d6d0a1d4075ccba30bad0d5385c486081435c59e00ae554ed86201e3f4a690966781844d300ffc155788622e
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD50aa60ab363110f0aa1246f7b096c8c39
SHA1c5b1fe35e642f34081ddd46cec9c62acd9b0f46c
SHA256998bbb0696be547b13ba2c958208282244c1748f9e668e0a006b129975e1faa0
SHA5121c07aba4f4a1e84f2299c005d3f75b185d2178233d0eb0c9f3c15858931913d4a72dc9bbdddde20f46950bdd56818c867ab67251f3fbe9a4d0ed118ec7cdd5f4
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD57c05bbd626cd8d5f5bbe9815bb7c2834
SHA18e9649b9e52bb25578c508eef6fa501b4a14e869
SHA256eaea88baa41a8bf3a508f487cd49ef019c112159e9fd6caf46e5e1dbf74e8f44
SHA512ea0ae6bb8d602fbfe7c0e49c6ab1f0e10ff2fd79243f7e4e78c5cf13cd44c898415be7dba7721e0769d832d05ce9a7f8c3b48219faad3a42b893ce96ed19566c
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5093cfac630d6c10d1f363ffc9f6956c5
SHA1066269d5b6a1a3fc0552b2cdc6be08008be6f9a1
SHA25630b83457fd9dcdcad789c9880bf06035165d4acc0aabfa12265abdd92bb1fb14
SHA5120e4ac16e9eb62fa49472fddef0f8eeffe8a62f1096a856f37f1eb42116639506dd12c330fc41da7995f9d826aeab95b7531086a16d8c9739b9cd2b33ed2c6fb9
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD52bc18804bde91efcdc0220b96a425d36
SHA1472592704d8253762af2394a9cb031303285cce6
SHA256bb4dd3acfdcfcb7da0c37dd9cc42f2cc2be5bd2047ba2c53d08adc653b8c190e
SHA512fa84fd645f144f4ff0975aa79a03e612ca63706bc2d91c06e3fb61debd9f175a24f08a95f32111c87a0240a4c2e7a1dbcca5d6da7b231687ff3e2a2a1f46b894
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD56b66dd0e9210208e4f7fd6a714a695fd
SHA1e8f88cac0245ce8f9d053f8a296949c16ba7d07a
SHA256933c928da3faf1741b0145ae998d4faa92b540d6cde80f85c988cc68dde90c21
SHA512bdbe59818c986af3ce0c98abb41f86cc982d7544d157e1a2354c9f52a6098067fb59a976cc3676f3583b3f209e3462505cfa5afe364e903199842e0b412e12c4
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD568a5babf4eb9848a9a11467d84e4638f
SHA11dd5c855363dd895a881e6b255e9a8fddb941196
SHA256f0d4e4b73fa8699a8b04236f5bee688ad56fbc6f50dfef55b1b7993f947c2f67
SHA512486910507371e876c741844b9654fdcbfa451afaa0558726f458da546bf7fe79d4d7ec938ea8a1c0dbb86aa5999b12d9e3b95506fb264ab8534696a79ad81890
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD57b1cfab29de48c273f79e24c34c2107a
SHA1ce49718bfbaae70c7cf01f90f6fa17c80583270c
SHA2561a027b1abb4e0fda298e8e8bd67b2d4afeaa800836fb8dc2ea6cd31f7e55deb1
SHA512dbef5c281d1b03a0b75f1bb5988588b03fd317a7b1bbb50055b849848ef1362d49db36791e797dc81d96c6b345b03dfe9be16ff8e5f073cb475f120dc9409da2
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5c959ce3a4b543da56c947bdfa4671220
SHA135c3f22b6ad6e338fc06c353a7289a07b7b27749
SHA25642669feedc83683c634a1afa64088ac7556f1807a8d7ff0bf69974ed9b767c2e
SHA5124b7f22b981c141e2d7e97b369fdedac48c08a92ce06069fa32b9886f69186a7f93e6f46ba8eb726599e4fbdce8f5fc3965882406cd0454475a39d0c78fdae765
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD5f39ea165843a7c9a24850fe3ea180345
SHA1b5f620640c71f6130aff81ff79c994df258eb9e2
SHA2563f27af022ce948d9890d30bf4d9e758ba80f062cc422869344c89f9bd1f45e06
SHA51208248d568a55a8386bd24d051c2d1b73efb34d29301f6bc19c147552f78f41bdc2b019ad74033aa9e696c20dfdb8af6b4cc08cd26c0f4f6d7fc0cfb6ffe57687
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD576ddf27012c27b843c2e70cfa12c535e
SHA14fa3561cd15e7708e3f42758d7031b08283d904e
SHA2563d5e05274622aedda6a93796a2cfab0f43b6bcdcfcc4753dc2381957360b21b8
SHA512ec5ee5fdde4918cdfa4718a98a1291fdca7ce27c364aed2e674825bf8756258449a21684c5e478b5e58ee1180513245a07184902931bf86353453905dc4c9ab2
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD52e50e0e845e262850825179d37684d16
SHA16adf5eb474122b9d2ad2d51ab16aaea58b3c702c
SHA256115fd86d6559378ab8558adc7692fe6fc9ca5eee6f3f3273f38d86d55c0fd215
SHA5124bee37c33d3a106001d0f929518b7093f4670d88167f045e9c2f4b442c075f3d639d98fd5289e0e3db5d19ce3d8a8501348b9ca721109b0cbaafd23579d82fe0
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize344B
MD527509a26aed70902506bc6d9c85924a1
SHA17318fad75838a1242e35e8e3b43558bf84256912
SHA2564933b21e5811edd00ba79a51c1d485e554576e52d1133946301cceb15242e088
SHA51208dc00265714f6d890c9717a088be4790b6619f68d90cc4693232fd166342c2d9a89bf3838a5dd55ceb2e87b64c7f6edf9d8e51a00d7d8a26fc4986dc6e5d784
-
Filesize
61KB
MD5f3441b8572aae8801c04f3060b550443
SHA14ef0a35436125d6821831ef36c28ffaf196cda15
SHA2566720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf
SHA5125ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9
-
Filesize
163KB
MD59441737383d21192400eca82fda910ec
SHA1725e0d606a4fc9ba44aa8ffde65bed15e65367e4
SHA256bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5
SHA5127608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf