masslogger | f486c5d5fe3c9341cd331a8e6a68102a9bd7a9e7864c5179948c585806828006

General

Target

952110_2020713.exe
Size

1.3MB
MD5

52e2dd01e70bce5aac4f44e19c2876e1
SHA1

bf7326838f7b86565769f1c122bdebbbf5b6a097
SHA256

f486c5d5fe3c9341cd331a8e6a68102a9bd7a9e7864c5179948c585806828006
SHA512

1ab82d5d08de1f877ec4c45d75597f4d584460bf37c6e8e271f6ebc74a452f14b39c84cc22b2bf8a3fadeaa53f87881dcacafeeedfcaf500d34e09a8f659ddbd

Score

10^/10

persistence spyware stealer masslogger

Malware Config

Signatures

Executes dropped EXE 2 IoCs

Processes:

.exeRegAsm.exe

pid process

1832 .exe
1984 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

.exe

description pid process target process

PID 1832 set thread context of 1984 1832 .exe RegAsm.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081
MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.

Processes:

yara_rule

masslogger_log_file

pid	process
1832	.exe
1984	RegAsm.exe

description	pid	process	target process
PID 1832 set thread context of 1984	1832	.exe	RegAsm.exe

yara_rule
masslogger_log_file

Adds Run entry to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1131729243-447456001-3632642222-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1131729243-447456001-3632642222-1000\Software\Microsoft\Windows\CurrentVersion\Run\admin = "C:\\Windows\\system32\\pcalua.exe -a C:\\Users\\Admin\\Desktop\\.exe"	reg.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

5 api.ipify.org
MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

952110_2020713.exe.exeRegAsm.exe

description pid process

Token: SeDebugPrivilege 616 952110_2020713.exe
Token: SeDebugPrivilege 1832 .exe
Token: SeDebugPrivilege 1984 RegAsm.exe
Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

952110_2020713.exe.exeRegAsm.exe

pid process

616 952110_2020713.exe
616 952110_2020713.exe
616 952110_2020713.exe
1832 .exe
1832 .exe
1832 .exe
1984 RegAsm.exe

flow	ioc
5	api.ipify.org

description	pid	process
Token: SeDebugPrivilege	616	952110_2020713.exe
Token: SeDebugPrivilege	1832	.exe
Token: SeDebugPrivilege	1984	RegAsm.exe

pid	process
616	952110_2020713.exe
616	952110_2020713.exe
616	952110_2020713.exe
1832	.exe
1832	.exe
1832	.exe
1984	RegAsm.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

952110_2020713.execmd.exe.exe

description	pid	process	target process
PID 616 wrote to memory of 240	616	952110_2020713.exe	cmd.exe
PID 616 wrote to memory of 240	616	952110_2020713.exe	cmd.exe
PID 616 wrote to memory of 240	616	952110_2020713.exe	cmd.exe
PID 616 wrote to memory of 240	616	952110_2020713.exe	cmd.exe
PID 240 wrote to memory of 1072	240	cmd.exe	reg.exe
PID 240 wrote to memory of 1072	240	cmd.exe	reg.exe
PID 240 wrote to memory of 1072	240	cmd.exe	reg.exe
PID 240 wrote to memory of 1072	240	cmd.exe	reg.exe
PID 616 wrote to memory of 1832	616	952110_2020713.exe	.exe
PID 616 wrote to memory of 1832	616	952110_2020713.exe	.exe
PID 616 wrote to memory of 1832	616	952110_2020713.exe	.exe
PID 616 wrote to memory of 1832	616	952110_2020713.exe	.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe
PID 1832 wrote to memory of 1984	1832	.exe	RegAsm.exe

Loads dropped DLL 3 IoCs

Processes:

952110_2020713.exe.exeRegAsm.exe

pid process

616 952110_2020713.exe
1832 .exe
1984 RegAsm.exe

pid	process
616	952110_2020713.exe
1832	.exe
1984	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\952110_2020713.exe
"C:\Users\Admin\AppData\Local\Temp\952110_2020713.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- Loads dropped DLL
PID:616

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v admin /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\Desktop\.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:240

C:\Windows\SysWOW64\reg.exe
REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v admin /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\Desktop\.exe"
3⤵
- Adds Run entry to start application
PID:1072

C:\Users\Admin\Desktop\.exe
"C:\Users\Admin\Desktop\.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- Loads dropped DLL
PID:1832

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: EnumeratesProcesses
- Loads dropped DLL
PID:1984

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

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C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

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C:\Users\Admin\Desktop\.exe

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C:\Users\Admin\Desktop\.exe

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\Users\Admin\AppData\Local\Temp\RegAsm.exe

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\Users\Admin\AppData\Local\Temp\RegAsm.exe

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\Users\Admin\Desktop\.exe

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memory/240-3-0x0000000000000000-mapping.dmp

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memory/616-1-0x0000000000000000-0x0000000000000000-disk.dmp

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memory/1072-4-0x0000000000000000-mapping.dmp

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memory/1832-6-0x0000000000000000-mapping.dmp

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memory/1984-18-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

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memory/1984-19-0x000000000049415E-mapping.dmp

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memory/1984-21-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

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memory/1984-22-0x0000000000400000-0x000000000049A000-memory.dmp

Filesize
616KB

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Analysis

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