Analysis
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max time kernel
152s -
max time network
43s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
13-10-2022 18:26
Behavioral task
behavioral1
Sample
64ME_bul.exe
Resource
win7-20220812-en
windows7-x64
17 signatures
150 seconds
Behavioral task
behavioral2
Sample
64ME_bul.exe
Resource
win10v2004-20220812-en
windows10-2004-x64
15 signatures
150 seconds
General
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Target
64ME_bul.exe
-
Size
666KB
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MD5
f07dc09a859321bca78c1d7da99ad181
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SHA1
6d51174ce888641bc27d5ee968b19b472e014212
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SHA256
f064dfde1338a45c76c9cbbe9d7c8b358884c32c21510df14ab9b72df9ead1ba
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SHA512
c9597ef6570f0c806f74051ddeb85ac3a0fcd6fcee7815d7c64b29d474ee4894bb703796c01ebb700579cb938ef1a19cb7db36a3add470da4df717a419e3ef8e
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SSDEEP
12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulARC9+m:dd35lDbKDIwWUDyqS5omYC9+
Malware Config
Extracted
Path
C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\!-Recovery_Instructions-!.html
Ransom Note
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width,initial-scale=1'>
<title></title>
<style>
html, body {
background-color: #1a1a1a;
}
body {
padding-top: 1rem !important;
font-size: 1.3rem;
color: white;
}
#text h2 {
font-size: 2rem;
font-weight: 600;
line-height: 1.125;
}
.container {
max-width: 1152px;
flex-grow: 1;
margin: 0 auto;
position: relative;
width: auto;
}
.box {
background-color: #242424;
display: block;
padding: 1.25rem;
border: 1px solid #303030;
}
a {
color: #00b4d8;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
li {
margin-bottom: 10px;
}
</style>
</head>
<body>
<div class='container'>
<div class='box'>
<div id='text'>
<h2>If you get this message, your network was hacked!</h2>
<p>After we gained full access to your servers, we first downloaded a large amount of sensitive data and then encrypted all the data stored on them.</p>
<p>That includes personal information on your clients, partners, your personnel, accounting documents, and other crucial files that are necessary for your company to work normally.</p>
<p>We used modern complicated algorithms, so you or any recovery service will not be able to decrypt files without our help, wasting time on these attempts instead of negotiations can be fatal for your company.</p>
<p>Make sure to act within <span style='color:#f4a261;'>72</span> hours or the negotiations will be considered failed!</p>
<p>Inform your superior management about what's going on.</p>
<p> Contact us for price and get decryption software.</p>
<p> Contact us by email:<p>
<h2>[email protected]</h2>
</p>If you will get no answer within 24 hours contact us by our alternate emails:</p>
<h2>[email protected]</h2>
</p>To verify the possibility of the recovery of your files we can decrypted 1-3 file for free.</p>
</p>Attach file to the letter (no more than 5Mb).</p>
<h2>If you and us succeed the negotiations we will grant you:</h2>
<ul>
<li>complete confidentiality, we will keep in secret any information regarding to attack, your company will act as if nothing had happened.</li>
<li>comprehensive information about vulnerabilities of your network and security report.</li>
<li>software and instructions to decrypt all the data that was encrypted.</li>
<li>all sensitive downloaded data will be permanently deleted from our cloud storage and we will provide an erasure log.</li>
</ul>
<h2>Our options if you act like nothing's happening, refuse to make a deal or fail the negotiations:</h2>
<ul>
<li>inform the media and independent journalists about what happened to your servers. To prove it we'll publish a chunk of private data that you should have ciphered if you care about potential breaches.
Moreover, your company will inevitably take decent reputational loss which is hard to assess precisely.</li>
<li>inform your clients, employees, partners by phone, e-mail, sms and social networks that you haven't prevent their data leakage.
You will violate laws about private data protection.</li>
<li>start DDOS attack on you website and infrastructures.</li>
<li>personal data stored will be put on sale on the Darknet to find anyone interested to buy useful information regarding your company. It could be data mining agencies or your market competitors.</li>
<li>publish all the discovered vulnerabilities found in your network, so anyone will do anything with it.</li>
</ul>
<h2>Why pay us?</h2>
<p>We care about our reputation. You are welcome to google our cases up and be sure that we don't have a single case of failure to provide what we promissed.</p>
<p>Turning this issue to a bug bounty will save your private information, reputation and will allow you to use the security report and
avoid this kind of situations in future.</p>
<h2>Your personal ID</p>
15F69D44DCF2EFE3EB0B2808DB92667044E77C7C1424A54E4B83718C068585F82170FA39CC058AEEC4CF6502D02E44C080FC56E3933C6C580A067F645B5953D8<br>E5640D964D046F705624E9CDD95EA7D55BAA469E7AAF5EDC1139AB30F628B017431EBC1A900C36B4271D99586926513677B802B4AB3593161799E0697721<br>0A1D98D7468072EC7F1961A5600D7FB19F5B8AB2981806979BD60500285E1C1BBFA7555CF0C8E3180A74D55E2316E1CB074922C89BC4AB3E46D361398CAC<br>10120CFC912CA577D9610DE6C4F2EBFF2DBFE89803BB0B86CF16B4B8513E4D1839E8112A0400F482650B05D6FB72D1D1003855B89E2E3FCF6E586BEB733F<br>1BE8C10A4E5818E242FDB8ECAA3E3AFD28B74024C316757BB29732EC023819681E322140A3D7161D70A2067E93664EF917CEAC06C5CF17191AB7146C5858<br>84F77F874E67678A364F4C178AD975C5B7CD6B9C1EDAFE4D34E2174DB43F225E73A4437D56156BA3044060AA023425DE59DE91DD7DC9477BE42D7ED5291F<br>E9A78707DF492A19AFAF9F79D317249CC8B7FE665E6334C65113A095A452D9F71D3907D432BDC9CA68DE0AA088CB0629E9B6E71AE14840B8586DF36D20BA<br>0F87FCB9B53651D1EE8C33190E14353CBB6769F403BC26F788E135AA0414A089B2177F70CFD39E9C4700C3B58199919995A74404B15A21BAD569F9B53321<br>95EB0E993A98F8917D9CD9F9D343
Emails
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 2 IoCs
resource yara_rule behavioral1/files/0x0007000000005c50-61.dat family_medusalocker behavioral1/files/0x0007000000005c50-63.dat family_medusalocker -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul.exe -
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Detects MedusaLocker ransomware 2 IoCs
resource yara_rule behavioral1/files/0x0007000000005c50-61.dat MALWARE_Win_MedusaLocker behavioral1/files/0x0007000000005c50-63.dat MALWARE_Win_MedusaLocker -
Executes dropped EXE 1 IoCs
pid Process 1620 svhost.exe -
Modifies extensions of user files 12 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File renamed C:\Users\Admin\Pictures\DenyUndo.raw => C:\Users\Admin\Pictures\DenyUndo.raw.bulwark 64ME_bul.exe File opened for modification C:\Users\Admin\Pictures\OpenNew.tiff 64ME_bul.exe File opened for modification C:\Users\Admin\Pictures\UpdateRepair.tiff 64ME_bul.exe File opened for modification C:\Users\Admin\Pictures\WaitStep.tiff 64ME_bul.exe File renamed C:\Users\Admin\Pictures\ReadConvert.crw => C:\Users\Admin\Pictures\ReadConvert.crw.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\TestSkip.png => C:\Users\Admin\Pictures\TestSkip.png.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\UpdateRepair.tiff => C:\Users\Admin\Pictures\UpdateRepair.tiff.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\WaitStep.tiff => C:\Users\Admin\Pictures\WaitStep.tiff.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\CheckpointCompare.png => C:\Users\Admin\Pictures\CheckpointCompare.png.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\OpenDisconnect.crw => C:\Users\Admin\Pictures\OpenDisconnect.crw.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\OpenNew.tiff => C:\Users\Admin\Pictures\OpenNew.tiff.bulwark 64ME_bul.exe File renamed C:\Users\Admin\Pictures\ProtectConfirm.raw => C:\Users\Admin\Pictures\ProtectConfirm.raw.bulwark 64ME_bul.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul.exe -
Drops desktop.ini file(s) 1 IoCs
description ioc Process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-999675638-2867687379-27515722-1000\desktop.ini 64ME_bul.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\T: 64ME_bul.exe File opened (read-only) \??\A: 64ME_bul.exe File opened (read-only) \??\N: 64ME_bul.exe File opened (read-only) \??\O: 64ME_bul.exe File opened (read-only) \??\Q: 64ME_bul.exe File opened (read-only) \??\X: 64ME_bul.exe File opened (read-only) \??\J: 64ME_bul.exe File opened (read-only) \??\M: 64ME_bul.exe File opened (read-only) \??\S: 64ME_bul.exe File opened (read-only) \??\V: 64ME_bul.exe File opened (read-only) \??\P: 64ME_bul.exe File opened (read-only) \??\Y: 64ME_bul.exe File opened (read-only) \??\B: 64ME_bul.exe File opened (read-only) \??\F: 64ME_bul.exe File opened (read-only) \??\H: 64ME_bul.exe File opened (read-only) \??\L: 64ME_bul.exe File opened (read-only) \??\R: 64ME_bul.exe File opened (read-only) \??\U: 64ME_bul.exe File opened (read-only) \??\W: 64ME_bul.exe File opened (read-only) \??\Z: 64ME_bul.exe File opened (read-only) \??\E: 64ME_bul.exe File opened (read-only) \??\G: 64ME_bul.exe File opened (read-only) \??\I: 64ME_bul.exe File opened (read-only) \??\K: 64ME_bul.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 1416 vssadmin.exe 1884 vssadmin.exe 1540 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe 1160 64ME_bul.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
description pid Process Token: SeBackupPrivilege 1784 vssvc.exe Token: SeRestorePrivilege 1784 vssvc.exe Token: SeAuditPrivilege 1784 vssvc.exe Token: SeIncreaseQuotaPrivilege 1076 wmic.exe Token: SeSecurityPrivilege 1076 wmic.exe Token: SeTakeOwnershipPrivilege 1076 wmic.exe Token: SeLoadDriverPrivilege 1076 wmic.exe Token: SeSystemProfilePrivilege 1076 wmic.exe Token: SeSystemtimePrivilege 1076 wmic.exe Token: SeProfSingleProcessPrivilege 1076 wmic.exe Token: SeIncBasePriorityPrivilege 1076 wmic.exe Token: SeCreatePagefilePrivilege 1076 wmic.exe Token: SeBackupPrivilege 1076 wmic.exe Token: SeRestorePrivilege 1076 wmic.exe Token: SeShutdownPrivilege 1076 wmic.exe Token: SeDebugPrivilege 1076 wmic.exe Token: SeSystemEnvironmentPrivilege 1076 wmic.exe Token: SeRemoteShutdownPrivilege 1076 wmic.exe Token: SeUndockPrivilege 1076 wmic.exe Token: SeManageVolumePrivilege 1076 wmic.exe Token: 33 1076 wmic.exe Token: 34 1076 wmic.exe Token: 35 1076 wmic.exe Token: SeIncreaseQuotaPrivilege 240 wmic.exe Token: SeSecurityPrivilege 240 wmic.exe Token: SeTakeOwnershipPrivilege 240 wmic.exe Token: SeLoadDriverPrivilege 240 wmic.exe Token: SeSystemProfilePrivilege 240 wmic.exe Token: SeSystemtimePrivilege 240 wmic.exe Token: SeProfSingleProcessPrivilege 240 wmic.exe Token: SeIncBasePriorityPrivilege 240 wmic.exe Token: SeCreatePagefilePrivilege 240 wmic.exe Token: SeBackupPrivilege 240 wmic.exe Token: SeRestorePrivilege 240 wmic.exe Token: SeShutdownPrivilege 240 wmic.exe Token: SeDebugPrivilege 240 wmic.exe Token: SeSystemEnvironmentPrivilege 240 wmic.exe Token: SeRemoteShutdownPrivilege 240 wmic.exe Token: SeUndockPrivilege 240 wmic.exe Token: SeManageVolumePrivilege 240 wmic.exe Token: 33 240 wmic.exe Token: 34 240 wmic.exe Token: 35 240 wmic.exe Token: SeIncreaseQuotaPrivilege 868 wmic.exe Token: SeSecurityPrivilege 868 wmic.exe Token: SeTakeOwnershipPrivilege 868 wmic.exe Token: SeLoadDriverPrivilege 868 wmic.exe Token: SeSystemProfilePrivilege 868 wmic.exe Token: SeSystemtimePrivilege 868 wmic.exe Token: SeProfSingleProcessPrivilege 868 wmic.exe Token: SeIncBasePriorityPrivilege 868 wmic.exe Token: SeCreatePagefilePrivilege 868 wmic.exe Token: SeBackupPrivilege 868 wmic.exe Token: SeRestorePrivilege 868 wmic.exe Token: SeShutdownPrivilege 868 wmic.exe Token: SeDebugPrivilege 868 wmic.exe Token: SeSystemEnvironmentPrivilege 868 wmic.exe Token: SeRemoteShutdownPrivilege 868 wmic.exe Token: SeUndockPrivilege 868 wmic.exe Token: SeManageVolumePrivilege 868 wmic.exe Token: 33 868 wmic.exe Token: 34 868 wmic.exe Token: 35 868 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
description pid Process procid_target PID 1160 wrote to memory of 1416 1160 64ME_bul.exe 26 PID 1160 wrote to memory of 1416 1160 64ME_bul.exe 26 PID 1160 wrote to memory of 1416 1160 64ME_bul.exe 26 PID 1160 wrote to memory of 1416 1160 64ME_bul.exe 26 PID 1160 wrote to memory of 1076 1160 64ME_bul.exe 29 PID 1160 wrote to memory of 1076 1160 64ME_bul.exe 29 PID 1160 wrote to memory of 1076 1160 64ME_bul.exe 29 PID 1160 wrote to memory of 1076 1160 64ME_bul.exe 29 PID 1160 wrote to memory of 1884 1160 64ME_bul.exe 31 PID 1160 wrote to memory of 1884 1160 64ME_bul.exe 31 PID 1160 wrote to memory of 1884 1160 64ME_bul.exe 31 PID 1160 wrote to memory of 1884 1160 64ME_bul.exe 31 PID 1160 wrote to memory of 240 1160 64ME_bul.exe 33 PID 1160 wrote to memory of 240 1160 64ME_bul.exe 33 PID 1160 wrote to memory of 240 1160 64ME_bul.exe 33 PID 1160 wrote to memory of 240 1160 64ME_bul.exe 33 PID 1160 wrote to memory of 1540 1160 64ME_bul.exe 35 PID 1160 wrote to memory of 1540 1160 64ME_bul.exe 35 PID 1160 wrote to memory of 1540 1160 64ME_bul.exe 35 PID 1160 wrote to memory of 1540 1160 64ME_bul.exe 35 PID 1160 wrote to memory of 868 1160 64ME_bul.exe 37 PID 1160 wrote to memory of 868 1160 64ME_bul.exe 37 PID 1160 wrote to memory of 868 1160 64ME_bul.exe 37 PID 1160 wrote to memory of 868 1160 64ME_bul.exe 37 PID 280 wrote to memory of 1620 280 taskeng.exe 40 PID 280 wrote to memory of 1620 280 taskeng.exe 40 PID 280 wrote to memory of 1620 280 taskeng.exe 40 PID 280 wrote to memory of 1620 280 taskeng.exe 40 -
System policy modification 1 TTPs 3 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" 64ME_bul.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\64ME_bul.exe"C:\Users\Admin\AppData\Local\Temp\64ME_bul.exe"1⤵
- UAC bypass
- Modifies extensions of user files
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1160 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1416
-
-
C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1076
-
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1884
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:240
-
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1540
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:868
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1784
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C:\Windows\system32\taskeng.exetaskeng.exe {1C544AD9-C35E-42DE-9B47-FB820B5E9E11} S-1-5-21-999675638-2867687379-27515722-1000:ORXGKKZC\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:280 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:1620
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
666KB
MD5f07dc09a859321bca78c1d7da99ad181
SHA16d51174ce888641bc27d5ee968b19b472e014212
SHA256f064dfde1338a45c76c9cbbe9d7c8b358884c32c21510df14ab9b72df9ead1ba
SHA512c9597ef6570f0c806f74051ddeb85ac3a0fcd6fcee7815d7c64b29d474ee4894bb703796c01ebb700579cb938ef1a19cb7db36a3add470da4df717a419e3ef8e
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Filesize
666KB
MD5f07dc09a859321bca78c1d7da99ad181
SHA16d51174ce888641bc27d5ee968b19b472e014212
SHA256f064dfde1338a45c76c9cbbe9d7c8b358884c32c21510df14ab9b72df9ead1ba
SHA512c9597ef6570f0c806f74051ddeb85ac3a0fcd6fcee7815d7c64b29d474ee4894bb703796c01ebb700579cb938ef1a19cb7db36a3add470da4df717a419e3ef8e