tofsee | e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812

General

Target

e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe
Size

128KB
MD5

18557ef30c2b6532c74712ca0c6b8d30
SHA1

219d4c24f6c3d412704bb88e6ee53ccc81cda412
SHA256

e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812
SHA512

91cf614334250cbd1955f2577e8c9992854e2b5effc787d2b79e9afe1f69f48d83728320330d21c17b7249a5a50309cea2b13c7f441a4c9aa5a42429b0a83f7b
SSDEEP

3072:EQ1m24hjpYg2C47wRHpv0rZS2jbxWGqt:EQQNbjJmwxAZSbGq

Score

10^/10

tofsee persistence trojan

Malware Config

Extracted

Family

tofsee

C2

91.218.38.211

188.130.237.71

185.25.48.10

188.165.132.183

rgtryhbgddtyh.biz

wertdghbyrukl.ch

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Executes dropped EXE 1 IoCs

Processes:

erwjobuc.exe

pid process

4152 erwjobuc.exe

pid	process
4152	erwjobuc.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MSConfig = "\"C:\\Users\\Admin\\erwjobuc.exe\""	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

erwjobuc.exe

description pid process target process

PID 4152 set thread context of 3304 4152 erwjobuc.exe svchost.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2424 3304 WerFault.exe svchost.exe

description	pid	process	target process
PID 4152 set thread context of 3304	4152	erwjobuc.exe	svchost.exe

pid	pid_target	process	target process
2424	3304	WerFault.exe	svchost.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exeerwjobuc.exe

description	pid	process	target process
PID 4384 wrote to memory of 4152	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	erwjobuc.exe
PID 4384 wrote to memory of 4152	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	erwjobuc.exe
PID 4384 wrote to memory of 4152	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	erwjobuc.exe
PID 4152 wrote to memory of 3304	4152	erwjobuc.exe	svchost.exe
PID 4152 wrote to memory of 3304	4152	erwjobuc.exe	svchost.exe
PID 4152 wrote to memory of 3304	4152	erwjobuc.exe	svchost.exe
PID 4152 wrote to memory of 3304	4152	erwjobuc.exe	svchost.exe
PID 4152 wrote to memory of 3304	4152	erwjobuc.exe	svchost.exe
PID 4384 wrote to memory of 1376	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	cmd.exe
PID 4384 wrote to memory of 1376	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	cmd.exe
PID 4384 wrote to memory of 1376	4384	e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe
"C:\Users\Admin\AppData\Local\Temp\e77e9bd28dfc320d36293519ee10631996af59ccb93bb220b15ea21eb925b812.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4384

C:\Users\Admin\erwjobuc.exe
"C:\Users\Admin\erwjobuc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4152

C:\Windows\SysWOW64\svchost.exe
svchost.exe
3⤵
PID:3304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3304 -s 356
4⤵
- Program crash
PID:2424

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\8873.bat" "
2⤵
PID:1376

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3304 -ip 3304
1⤵
PID:4192

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

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\8873.bat
Filesize
302B

MD5
1e289fe8333eb92b7d6e9bf429f19df7

SHA1
2aa65dfd109e4761320ba77c7ef673ed330ec40f

SHA256
81bbedbed2653d500ed3264df40700053b523d39efd99ee14e1c204c88f5e45c

SHA512
8189bc3b2e7bd19d2f2ed429901a5c7ebd9af626c40a6c93eb9f579d7c3c08827617be41915e5505971159088db98fb56adb5e5d710153755048e54fe9a89dc3

Download Submit
C:\Users\Admin\erwjobuc.exe
Filesize
35.5MB

MD5
db73df4f691ff66052e452a487624b41

SHA1
935124f038691b7a05f38f3cfb4d0e24d66085b6

SHA256
9100f4a206fb522a3e9f24c5778de875b3a6082a5acba91a153a2c01f2aa6712

SHA512
faee7cc86d84c414d1eea920d952b8c358b4e43bcb92bc567a70af8adff08cdca01dafb3d1afe69f4f581d2f1fbd76a44936599d1ec3536078c0624f68ad7b38

Download Submit
C:\Users\Admin\erwjobuc.exe
Filesize
35.5MB

MD5
db73df4f691ff66052e452a487624b41

SHA1
935124f038691b7a05f38f3cfb4d0e24d66085b6

SHA256
9100f4a206fb522a3e9f24c5778de875b3a6082a5acba91a153a2c01f2aa6712

SHA512
faee7cc86d84c414d1eea920d952b8c358b4e43bcb92bc567a70af8adff08cdca01dafb3d1afe69f4f581d2f1fbd76a44936599d1ec3536078c0624f68ad7b38

Download Submit
memory/1376-145-0x0000000000000000-mapping.dmp

Download
memory/3304-144-0x0000000000EE0000-0x0000000000EF2000-memory.dmp

Filesize
72KB

Download
memory/3304-148-0x0000000000EE0000-0x0000000000EF2000-memory.dmp

Filesize
72KB

Download
memory/3304-136-0x0000000000000000-mapping.dmp

Download
memory/3304-137-0x0000000000EE0000-0x0000000000EF2000-memory.dmp

Filesize
72KB

Download
memory/4152-139-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4152-141-0x0000000002060000-0x0000000002072000-memory.dmp

Filesize
72KB

Download
memory/4152-133-0x0000000000000000-mapping.dmp

Download
memory/4384-143-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/4384-142-0x0000000000680000-0x0000000000692000-memory.dmp

Filesize
72KB

Download
memory/4384-146-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4384-132-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads