Analysis
-
max time kernel
149s -
max time network
153s -
platform
windows10-2004_x64 -
resource
win10v2004-20230220-en -
resource tags
arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system -
submitted
17/03/2023, 06:18
Static task
static1
Behavioral task
behavioral1
Sample
service.exe
Resource
win7-20230220-en
General
-
Target
service.exe
-
Size
283KB
-
MD5
c801ed2ca1f4f204ca5d28a6ab366949
-
SHA1
781f35df9b44560982623ef0259a05fbf99b8fcc
-
SHA256
c83bb3ba68f3f4fde63abea1a95a89566c4a8b75bac40d47b8733a1dac0d1658
-
SHA512
2d910f09aaeaf0ad6e769f5148ce61f4d284468da1f109434602e2e4c7ddd567d41cd6dae95aba72133dc77fcf35d9814be6c645d05f40d8268ab9036adce45b
-
SSDEEP
6144:7gZiAEAO0sByNsAal3gVAWgS7/OhwjKfqZr:7gZXEAO/BUdG3gVdt7KnfqZr
Malware Config
Extracted
https://pastebin.com/raw/vNcCt60A
Extracted
asyncrat
0.5.7B
Default
Mutex
-
delay
3
-
install
false
-
install_folder
%AppData%
-
pastebin_config
https://pastebin.com/raw/s14cUU5G
Signatures
-
Async RAT payload 3 IoCs
resource yara_rule behavioral2/files/0x0006000000022f9b-185.dat asyncrat behavioral2/files/0x0006000000022f9b-186.dat asyncrat behavioral2/memory/652-187-0x0000000000E00000-0x0000000000E12000-memory.dmp asyncrat -
Blocklisted process makes network request 2 IoCs
flow pid Process 27 4696 powershell.exe 30 4696 powershell.exe -
Downloads MZ/PE file
-
Sets file to hidden 1 TTPs 1 IoCs
Modifies file attributes to stop it showing in Explorer etc.
pid Process 2720 attrib.exe -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation service.exe Key value queried \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation WScript.exe -
Drops startup file 2 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe powershell.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe attrib.exe -
Executes dropped EXE 1 IoCs
pid Process 652 tmp7DD6.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs
-
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
-
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000_Classes\Local Settings service.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 4696 powershell.exe 4696 powershell.exe -
Suspicious use of AdjustPrivilegeToken 24 IoCs
description pid Process Token: SeDebugPrivilege 4696 powershell.exe Token: SeIncreaseQuotaPrivilege 4696 powershell.exe Token: SeSecurityPrivilege 4696 powershell.exe Token: SeTakeOwnershipPrivilege 4696 powershell.exe Token: SeLoadDriverPrivilege 4696 powershell.exe Token: SeSystemProfilePrivilege 4696 powershell.exe Token: SeSystemtimePrivilege 4696 powershell.exe Token: SeProfSingleProcessPrivilege 4696 powershell.exe Token: SeIncBasePriorityPrivilege 4696 powershell.exe Token: SeCreatePagefilePrivilege 4696 powershell.exe Token: SeBackupPrivilege 4696 powershell.exe Token: SeRestorePrivilege 4696 powershell.exe Token: SeShutdownPrivilege 4696 powershell.exe Token: SeDebugPrivilege 4696 powershell.exe Token: SeSystemEnvironmentPrivilege 4696 powershell.exe Token: SeRemoteShutdownPrivilege 4696 powershell.exe Token: SeUndockPrivilege 4696 powershell.exe Token: SeManageVolumePrivilege 4696 powershell.exe Token: 33 4696 powershell.exe Token: 34 4696 powershell.exe Token: 35 4696 powershell.exe Token: 36 4696 powershell.exe Token: SeDebugPrivilege 652 tmp7DD6.exe Token: SeDebugPrivilege 652 tmp7DD6.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 824 wrote to memory of 1068 824 service.exe 85 PID 824 wrote to memory of 1068 824 service.exe 85 PID 824 wrote to memory of 1068 824 service.exe 85 PID 1068 wrote to memory of 4696 1068 WScript.exe 86 PID 1068 wrote to memory of 4696 1068 WScript.exe 86 PID 1068 wrote to memory of 4696 1068 WScript.exe 86 PID 4696 wrote to memory of 2720 4696 powershell.exe 96 PID 4696 wrote to memory of 2720 4696 powershell.exe 96 PID 4696 wrote to memory of 2720 4696 powershell.exe 96 PID 4696 wrote to memory of 652 4696 powershell.exe 97 PID 4696 wrote to memory of 652 4696 powershell.exe 97 PID 4696 wrote to memory of 652 4696 powershell.exe 97 -
Views/modifies file attributes 1 TTPs 1 IoCs
pid Process 2720 attrib.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\service.exe"C:\Users\Admin\AppData\Local\Temp\service.exe"1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:824 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs"2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1068 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Unrestricted -nologo -command .\service.ps13⤵
- Blocklisted process makes network request
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4696 -
C:\Windows\SysWOW64\attrib.exe"C:\Windows\System32\attrib.exe" +s +h .\\tmp7DD6.exe4⤵
- Sets file to hidden
- Drops startup file
- Views/modifies file attributes
PID:2720
-
-
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe"4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:652
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
149B
MD5a5871da9a2df94e7f9e631b8d88db6f2
SHA10fe4a2d4ee43f0ddd04fdf6fcf18ea157f197b6b
SHA256c3da432bc28fc4cd5346b0b1350217dbc1fb5939dd3436a1a1415d5f5a4c821d
SHA5124c31e60bd2d823eec6f3c83973b0845c104632006877e3960ff3c7abc69b05f41d09a2dcede557d642b5e74a128800dfd543f2f88026a1400172ec4ea850084c
-
Filesize
949B
MD58a97b217587bf21df5b6be29428a1251
SHA133bc1ad54acc40f29d1b09767811c4a9f779f9a5
SHA256ac975c8129b58f138e0f9880d5d63e6ca9e350c875e09a6dd5c16b40eaa9ea0d
SHA512944c4fbbb3e92afad4cb4fc9f675cbe0b12ff3ef371fa1a5acdffb8489d7c7dde6e2cb8c2a1e194db9eba8e7c74db82b91ceaa40bc3f189924adaeae01cc2409
-
Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
-
Filesize
48KB
MD5fa378b2bb6985eec44142dca9f381985
SHA15b6614fcfc131772ab7d8e9df13b84a9c8b8aec0
SHA25607280cbf4815aba1b1841d4eeb86df01483c240301006c4f1d566e152e1ad783
SHA512117dbd8efaedec137667fd6cd64db0ad2d1396118aeb29fcbf2e7876c4f68d085ccfe5526f586aedbd5e22d4f4e986ff1660b182e6f375d46cd900efe57cc0fa
-
Filesize
48KB
MD5fa378b2bb6985eec44142dca9f381985
SHA15b6614fcfc131772ab7d8e9df13b84a9c8b8aec0
SHA25607280cbf4815aba1b1841d4eeb86df01483c240301006c4f1d566e152e1ad783
SHA512117dbd8efaedec137667fd6cd64db0ad2d1396118aeb29fcbf2e7876c4f68d085ccfe5526f586aedbd5e22d4f4e986ff1660b182e6f375d46cd900efe57cc0fa