ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4

General

Target

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
Size

22KB
MD5

a421d4db22bf09c8a91c1d1faed3ab25
SHA1

72413e8f3a43820fb7b019ff1dc6c92ad34be1ae
SHA256

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4
SHA512

752556e02f30593b9d6bc85d9d5511dd74bad0befb64a15b414373d9be3a149b7f79be6f0ad2a492278cd8bc75c93d23360573ec607f17323e8d5b9edec3e3c6
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXVB7M:rRkiLw3HsDSARGG/rM

Score

10^/10

evasion persistence trojan upx

Malware Config

Signatures

Windows security bypass 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe

Drops file in Drivers directory 1 IoCs

Processes:

rmass.exe

description ioc process

File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe

description	ioc	process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	rmass.exe

Modifies Installed Components in the registry 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F41494C-5643-4e59-4F41-494C56434e59}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F41494C-5643-4e59-4F41-494C56434e59}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F41494C-5643-4e59-4F41-494C56434e59}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F41494C-5643-4e59-4F41-494C56434e59}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Sets file execution options in registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe

Executes dropped EXE 2 IoCs

Processes:

rmass.exermass.exe

pid process

764 rmass.exe
228 rmass.exe

pid	process
764	rmass.exe
228	rmass.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/4972-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
C:\Windows\SysWOW64\rmass.exe	upx
behavioral2/memory/4972-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/764-71-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/228-78-0x0000000000400000-0x0000000000411000-memory.dmp	upx

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\DLLName = "C:\\Windows\\system32\\RECOVER32.DLL"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe

Drops file in System32 directory 12 IoCs

Processes:

rmass.exeee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe

description	ioc	process
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe

Drops file in Program Files directory 3 IoCs

Processes:

rmass.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Common Files\System\winrnt.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\aset32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\idbg32.exe	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

rmass.exermass.exe

pid process

764 rmass.exe
764 rmass.exe
764 rmass.exe
764 rmass.exe
764 rmass.exe
764 rmass.exe
228 rmass.exe
228 rmass.exe

pid	process
764	rmass.exe
764	rmass.exe
764	rmass.exe
764	rmass.exe
764	rmass.exe
764	rmass.exe
228	rmass.exe
228	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exermass.exe

description	pid	process
Token: SeDebugPrivilege	4972	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
Token: SeDebugPrivilege	764	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exermass.exe

description	pid	process	target process
PID 4972 wrote to memory of 764	4972	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 4972 wrote to memory of 764	4972	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 4972 wrote to memory of 764	4972	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 764 wrote to memory of 228	764	rmass.exe	rmass.exe
PID 764 wrote to memory of 228	764	rmass.exe	rmass.exe
PID 764 wrote to memory of 228	764	rmass.exe	rmass.exe
PID 764 wrote to memory of 612	764	rmass.exe	winlogon.exe
PID 764 wrote to memory of 3332	764	rmass.exe	Explorer.EXE

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3332

C:\Users\Admin\AppData\Local\Temp\ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
"C:\Users\Admin\AppData\Local\Temp\ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe"
2⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4972

C:\Windows\SysWOW64\rmass.exe
"C:\Windows\system32\rmass.exe"
3⤵
- Windows security bypass
- Drops file in Drivers directory
- Modifies Installed Components in the registry
- Sets file execution options in registry
- Executes dropped EXE
- Windows security modification
- Modifies WinLogon
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:764

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:228

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4272 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:672

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Windows\SysWOW64\RECOVER32.DLL
Filesize
5KB

MD5
2b2c28a7a01f9584fe220ef84003427f

SHA1
5fc023df0b5064045eb8de7f2dbe26f07f6fec70

SHA256
9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb

SHA512
39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78

Download Submit
C:\Windows\SysWOW64\ahuy.exe
Filesize
24KB

MD5
1ad59a4e02c912df78fb913bd575d1fd

SHA1
f6952f443309cf31aa309108cbaa86208101da51

SHA256
9da86ecbed0272c3b649eb43f031cd6934e3068e52597bb63480b34e05c9c7c2

SHA512
ea9e559c0d7609d083eadb427314cb6d98879e3567b224ba0a162b13cdba071c1b24cf85f3700d99c4e295fec2d25471ee2f6837883a1d354a9c10a979f400d6

Download Submit
C:\Windows\SysWOW64\ntdbg.exe
Filesize
25KB

MD5
df10e2ce99ecef2d20dc646e745e1db0

SHA1
04b278d21bbbaf27fb977e8b759e58bd88d1040e

SHA256
742dfd9823be716ec0d9799cacf18e0753a4c48f3204bb020e2ecc971aeb0a69

SHA512
40a42d0a2836536802e739740536b63c8166d091a34454dd84e0fda2048576306676de7454c00db48a683966451003add275b31edc974e9a7a45123bfc2b804f

Download Submit
C:\Windows\SysWOW64\rmass.exe
Filesize
22KB

MD5
a421d4db22bf09c8a91c1d1faed3ab25

SHA1
72413e8f3a43820fb7b019ff1dc6c92ad34be1ae

SHA256
ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4

SHA512
752556e02f30593b9d6bc85d9d5511dd74bad0befb64a15b414373d9be3a149b7f79be6f0ad2a492278cd8bc75c93d23360573ec607f17323e8d5b9edec3e3c6

Download Submit
C:\Windows\System32\drivers\etc\hosts
Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/228-78-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/764-71-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4972-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4972-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads