bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b

Analysis

max time kernel
201s
max time network
287s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
27/11/2022, 13:23

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General

Target

bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Size

32KB
MD5

b4c076ad22ad25ecd22841c1caa6ff72
SHA1

78aa047397b56ad3a8616a70abbe0089aa879a27
SHA256

bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b
SHA512

b17aab57a1473c6418682b1b308fb45e0b682bf9602af32103ea96417f6bf25315463a713f01665e73a818d323372f7b5a548ac499bb7d89aa86b312da41393f
SSDEEP

768:zgpcJkoH/cYLeV/omwUZJt6R7pA21KUsFZh4naaj:ufoH0lpweJt6R7pA21KRThQzj

Score

10^/10

evasion persistence trojan

Malware Config

Signatures

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Audio Driver = "C:\\Program Files\\Common Files\\lsass.exe"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe

Executes dropped EXE 2 IoCs

pid	Process
1636	csrss.exe
628	lsass.exe

Modifies Installed Components in the registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{f952a1c4-6219-11ed-b738-806e6f6e6963}	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{f952a1c4-6219-11ed-b738-806e6f6e6963}\StubPath = "C:\\ProgramData\\csrss.exe -r"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{f952a1c4-6219-11ed-b738-806e6f6e6963}\IsInstalled = "1"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1684	netsh.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Audio Driver = "C:\\ProgramData\\csrss.exe"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\lsass.exe	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
File opened for modification	C:\Program Files\Common Files\lsass.exe	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Token: SeDebugPrivilege	1636	csrss.exe
Token: SeDebugPrivilege	628	lsass.exe
Token: SeIncreaseQuotaPrivilege	1636	csrss.exe
Token: SeSecurityPrivilege	1636	csrss.exe
Token: SeTakeOwnershipPrivilege	1636	csrss.exe
Token: SeLoadDriverPrivilege	1636	csrss.exe
Token: SeSystemProfilePrivilege	1636	csrss.exe
Token: SeSystemtimePrivilege	1636	csrss.exe
Token: SeProfSingleProcessPrivilege	1636	csrss.exe
Token: SeIncBasePriorityPrivilege	1636	csrss.exe
Token: SeCreatePagefilePrivilege	1636	csrss.exe
Token: SeBackupPrivilege	1636	csrss.exe
Token: SeRestorePrivilege	1636	csrss.exe
Token: SeShutdownPrivilege	1636	csrss.exe
Token: SeDebugPrivilege	1636	csrss.exe
Token: SeSystemEnvironmentPrivilege	1636	csrss.exe
Token: SeRemoteShutdownPrivilege	1636	csrss.exe
Token: SeUndockPrivilege	1636	csrss.exe
Token: SeManageVolumePrivilege	1636	csrss.exe
Token: 33	1636	csrss.exe
Token: 34	1636	csrss.exe
Token: 35	1636	csrss.exe
Token: SeIncreaseQuotaPrivilege	1636	csrss.exe
Token: SeSecurityPrivilege	1636	csrss.exe
Token: SeTakeOwnershipPrivilege	1636	csrss.exe
Token: SeLoadDriverPrivilege	1636	csrss.exe
Token: SeSystemProfilePrivilege	1636	csrss.exe
Token: SeSystemtimePrivilege	1636	csrss.exe
Token: SeProfSingleProcessPrivilege	1636	csrss.exe
Token: SeIncBasePriorityPrivilege	1636	csrss.exe
Token: SeCreatePagefilePrivilege	1636	csrss.exe
Token: SeBackupPrivilege	1636	csrss.exe
Token: SeRestorePrivilege	1636	csrss.exe
Token: SeShutdownPrivilege	1636	csrss.exe
Token: SeDebugPrivilege	1636	csrss.exe
Token: SeSystemEnvironmentPrivilege	1636	csrss.exe
Token: SeRemoteShutdownPrivilege	1636	csrss.exe
Token: SeUndockPrivilege	1636	csrss.exe
Token: SeManageVolumePrivilege	1636	csrss.exe
Token: 33	1636	csrss.exe
Token: 34	1636	csrss.exe
Token: 35	1636	csrss.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1120 wrote to memory of 1636	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	28
PID 1120 wrote to memory of 1636	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	28
PID 1120 wrote to memory of 1636	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	28
PID 1120 wrote to memory of 628	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	29
PID 1120 wrote to memory of 628	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	29
PID 1120 wrote to memory of 628	1120	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe	29
PID 1636 wrote to memory of 1684	1636	csrss.exe	30
PID 1636 wrote to memory of 1684	1636	csrss.exe	30
PID 1636 wrote to memory of 1684	1636	csrss.exe	30

System policy modification 1 TTPs 2 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

C:\Users\Admin\AppData\Local\Temp\bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe
"C:\Users\Admin\AppData\Local\Temp\bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b.exe"
1⤵
- UAC bypass
- Adds policy Run key to start application
- Modifies Installed Components in the registry
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1120
- C:\ProgramData\csrss.exe
  "C:\ProgramData\csrss.exe"
  2⤵
  - UAC bypass
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:1636
- - C:\Windows\system32\netsh.exe
    "netsh.exe" firewall add allowedprogram program="C:\ProgramData\csrss.exe" name="Audio Driver" mode=ENABLE scope=ALL profile=ALL
    3⤵
    - Modifies Windows Firewall
    PID:1684
- C:\Program Files\Common Files\lsass.exe
  "C:\Program Files\Common Files\lsass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:628

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\Common Files\lsass.exe

Filesize
32KB

MD5
b4c076ad22ad25ecd22841c1caa6ff72

SHA1
78aa047397b56ad3a8616a70abbe0089aa879a27

SHA256
bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b

SHA512
b17aab57a1473c6418682b1b308fb45e0b682bf9602af32103ea96417f6bf25315463a713f01665e73a818d323372f7b5a548ac499bb7d89aa86b312da41393f

Download Submit
C:\Program Files\Common Files\lsass.exe

Filesize
32KB

MD5
b4c076ad22ad25ecd22841c1caa6ff72

SHA1
78aa047397b56ad3a8616a70abbe0089aa879a27

SHA256
bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b

SHA512
b17aab57a1473c6418682b1b308fb45e0b682bf9602af32103ea96417f6bf25315463a713f01665e73a818d323372f7b5a548ac499bb7d89aa86b312da41393f

Download Submit
C:\ProgramData\csrss.exe

Filesize
32KB

MD5
b4c076ad22ad25ecd22841c1caa6ff72

SHA1
78aa047397b56ad3a8616a70abbe0089aa879a27

SHA256
bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b

SHA512
b17aab57a1473c6418682b1b308fb45e0b682bf9602af32103ea96417f6bf25315463a713f01665e73a818d323372f7b5a548ac499bb7d89aa86b312da41393f

Download Submit
C:\ProgramData\csrss.exe

Filesize
32KB

MD5
b4c076ad22ad25ecd22841c1caa6ff72

SHA1
78aa047397b56ad3a8616a70abbe0089aa879a27

SHA256
bc391f3d31649d8f0698f5e9759ff0a003df8ff2bfa135dfef5646b0e566214b

SHA512
b17aab57a1473c6418682b1b308fb45e0b682bf9602af32103ea96417f6bf25315463a713f01665e73a818d323372f7b5a548ac499bb7d89aa86b312da41393f

Download Submit
memory/628-63-0x000007FEF4170000-0x000007FEF4B93000-memory.dmp

Filesize
10.1MB

Download
memory/1120-54-0x000007FEF4170000-0x000007FEF4B93000-memory.dmp

Filesize
10.1MB

Download
memory/1120-55-0x000007FEFBB31000-0x000007FEFBB33000-memory.dmp

Filesize
8KB

Download
memory/1636-62-0x000007FEF4170000-0x000007FEF4B93000-memory.dmp

Filesize
10.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads