3a70394c394cb59907b5798a96a582f37ce62885fadd73267df25ad680141289

Analysis

max time kernel
7s
max time network
33s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
06-01-2023 14:02

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General

Target

msedge.exe
Size

413KB
MD5

cee276c40f8aa85fe77c1e43cb87cb9b
SHA1

f57853fb3bb038887c0773a100cec95837bc2039
SHA256

3a70394c394cb59907b5798a96a582f37ce62885fadd73267df25ad680141289
SHA512

7db64681c0d854d1e3beed72ee4cabbd7c71a9eae84c41a9cd03da6e9494986943975596a4a3ba8ac9d164dd27cb4437d16a2b7150f9a78445d06699abe3ca2b
SSDEEP

6144:95yaXtrA/WSo1rl3ALrlHQpn0BwK3SBDmhYfFQCU:9TX6WSofcZ+KCIGDU

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

fmSTr.exe

pid process

2960 fmSTr.exe

pid	process
2960	fmSTr.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

msedge.exefmSTr.exe

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

Adds Run key 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-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\fmSTr.exe"	reg.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

fmSTr.exe

pid process

2960 fmSTr.exe
2960 fmSTr.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

fmSTr.exe

description pid process

Token: SeDebugPrivilege 2960 fmSTr.exe

pid	process
2960	fmSTr.exe
2960	fmSTr.exe

description	pid	process
Token: SeDebugPrivilege	2960	fmSTr.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

msedge.exefmSTr.execmd.exe

description	pid	process	target process
PID 3856 wrote to memory of 2960	3856	msedge.exe	fmSTr.exe
PID 3856 wrote to memory of 2960	3856	msedge.exe	fmSTr.exe
PID 2960 wrote to memory of 2376	2960	fmSTr.exe	cmd.exe
PID 2960 wrote to memory of 2376	2960	fmSTr.exe	cmd.exe
PID 2960 wrote to memory of 2304	2960	fmSTr.exe	sihost.exe
PID 2376 wrote to memory of 4832	2376	cmd.exe	reg.exe
PID 2376 wrote to memory of 4832	2376	cmd.exe	reg.exe
PID 2960 wrote to memory of 2328	2960	fmSTr.exe	svchost.exe
PID 2960 wrote to memory of 2432	2960	fmSTr.exe	taskhostw.exe
PID 2960 wrote to memory of 2708	2960	fmSTr.exe	svchost.exe
PID 2960 wrote to memory of 3228	2960	fmSTr.exe	DllHost.exe

C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
1⤵
PID:3228

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
1⤵
PID:2708

C:\Windows\system32\taskhostw.exe
taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
1⤵
PID:2432

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
1⤵
PID:2328

C:\Windows\system32\sihost.exe
sihost.exe
1⤵
PID:2304

C:\Users\Admin\AppData\Local\Temp\msedge.exe
"C:\Users\Admin\AppData\Local\Temp\msedge.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3856

C:\users\Public\fmSTr.exe
"C:\users\Public\fmSTr.exe" C:\Users\Admin\AppData\Local\Temp\msedge.exe
2⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2960

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\fmSTr.exe" /f
3⤵
- Suspicious use of WriteProcessMemory
PID:2376

C:\Windows\system32\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\fmSTr.exe" /f
4⤵
- Adds Run key to start application
PID:4832

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Public\fmSTr.exe
Filesize
170KB

MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
C:\users\Public\fmSTr.exe
Filesize
170KB

MD5
31bd0f224e7e74eee2847f43aae23974

SHA1
92e331e1e8ad30538f38dd7ba31386afafa14a58

SHA256
8b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d

SHA512
a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249

Download Submit
memory/2304-137-0x00007FF7F8D10000-0x00007FF7F909E000-memory.dmp

Filesize
3.6MB

Download
memory/2376-135-0x0000000000000000-mapping.dmp

Download
memory/2960-132-0x0000000000000000-mapping.dmp

Download
memory/4832-136-0x0000000000000000-mapping.dmp

Download