modiloader | c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2

General

Target

c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe
Size

320KB
MD5

1e578331b11a7c1187c32a61e074b440
SHA1

c87728e54ac1ec0b19a751b4feb52bae9e388812
SHA256

c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2
SHA512

06a7791bbbf2503c996b96e6c8b208d3a9e6ffef8ffd7b4a8afbbe0a434bfee6ee75baada59bc1b9b8ba16c32fd4ec34092777f424bc85196df5cc1eff053ff9
SSDEEP

6144:kG377xS2Vp2CeiorXhwTBF53FpcCJJvHUEgoS8:fr7xS2Vp6FwT3bJJvHooS8

Score

10^/10

modiloader evasion persistence trojan upx

Malware Config

Signatures

ModiLoader, DBatLoader
ModiLoader is a Delphi loader that misuses cloud services to download other malicious families.
trojan modiloader

UAC bypass 3 TTPs 1 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"	csrssx.exe

ModiLoader Second Stage 4 IoCs

resource	yara_rule
behavioral1/files/0x000c0000000054a8-56.dat	modiloader_stage2
behavioral1/memory/1660-58-0x0000000000400000-0x0000000000452000-memory.dmp	modiloader_stage2
behavioral1/memory/1680-60-0x0000000000400000-0x0000000000452000-memory.dmp	modiloader_stage2
behavioral1/memory/1680-61-0x0000000000400000-0x0000000000452000-memory.dmp	modiloader_stage2

Executes dropped EXE 1 IoCs

pid	Process
1680	csrssx.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000c0000000054a8-56.dat	upx
behavioral1/memory/1660-58-0x0000000000400000-0x0000000000452000-memory.dmp	upx
behavioral1/memory/1680-60-0x0000000000400000-0x0000000000452000-memory.dmp	upx
behavioral1/memory/1680-61-0x0000000000400000-0x0000000000452000-memory.dmp	upx

Deletes itself 1 IoCs

pid	Process
1680	csrssx.exe

Adds 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\USER\S-1-5-21-3845472200-3839195424-595303356-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\	csrssx.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run\Policy = "C:\\Windows\\csrssx.exe"	csrssx.exe

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	csrssx.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrssx.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\csrssx.exe	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe
File opened for modification	C:\Windows\csrssx.exe	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe
File created	C:\Windows\ntdtcstp.dll	csrssx.exe
File created	C:\Windows\cmsetac.dll	csrssx.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 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1660	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe
Token: SeDebugPrivilege	1680	csrssx.exe
Token: SeDebugPrivilege	1680	csrssx.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1680	csrssx.exe
1680	csrssx.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1660 wrote to memory of 1680	1660	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe	28
PID 1660 wrote to memory of 1680	1660	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe	28
PID 1660 wrote to memory of 1680	1660	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe	28
PID 1660 wrote to memory of 1680	1660	c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe	28

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

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

C:\Users\Admin\AppData\Local\Temp\c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe
"C:\Users\Admin\AppData\Local\Temp\c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe"
1⤵
- Checks whether UAC is enabled
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1660
- C:\Windows\csrssx.exe
  "C:\Windows\csrssx.exe" \melt "C:\Users\Admin\AppData\Local\Temp\c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2.exe"
  2⤵
  - UAC bypass
  - Executes dropped EXE
  - Deletes itself
  - Adds Run key to start application
  - Checks whether UAC is enabled
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - System policy modification
  PID:1680

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\csrssx.exe

Filesize
320KB

MD5
1e578331b11a7c1187c32a61e074b440

SHA1
c87728e54ac1ec0b19a751b4feb52bae9e388812

SHA256
c7f51c196be27cd30236610f5e2136533dbe7d315b9d1b63367e5b007d80cdc2

SHA512
06a7791bbbf2503c996b96e6c8b208d3a9e6ffef8ffd7b4a8afbbe0a434bfee6ee75baada59bc1b9b8ba16c32fd4ec34092777f424bc85196df5cc1eff053ff9

Download Submit
memory/1660-54-0x0000000075FB1000-0x0000000075FB3000-memory.dmp

Filesize
8KB

Download
memory/1660-58-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1680-55-0x0000000000000000-mapping.dmp

Download
memory/1680-59-0x0000000001E60000-0x0000000001E6E000-memory.dmp

Filesize
56KB

Download
memory/1680-60-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download
memory/1680-61-0x0000000000400000-0x0000000000452000-memory.dmp

Filesize
328KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads