Analysis
- max time kernel
151s - max time network
124s - platform
windows7_x64 - resource
win7v20201028 - submitted
01/01/2021, 07:33
Static task
static1
Behavioral task
behavioral1
Sample
b05ef332fdb673343ef00b7d017fa637.exe
Resource
win7v20201028
windows7_x64
0 signatures
0 seconds
Behavioral task
behavioral2
Sample
b05ef332fdb673343ef00b7d017fa637.exe
Resource
win10v20201028
windows10_x64
0 signatures
0 seconds
General
- Target b05ef332fdb673343ef00b7d017fa637.exe
- Size 4.7MB
- Sample210101-94yphpggle
- SHA256 a4053c9427fa00b62f65abf8ad7760e39df7f7ea0c72ed89375e2076f7cb79a3
- MD5 b05ef332fdb673343ef00b7d017fa637
- SHA1 95ce92fd3ecab7d8d5d3dfbaba3b825c31c5c1c1
- SHA512 a83ac61a445b2cae84587619e16bc0414472ba4639115cc361c3c209744a4c6688e48aaa5a8881648a5fb424cfb1bb25e88b18bedb6fb85075837be6a1e4a303
- MD5 SHA1 SHA512
Score
8/10
Malware Config
Signatures
- Drops file in Drivers directory 1 IoCs
description ioc Process File created C:\Windows\system32\drivers\QAssist.sys Stlmn.exe - Executes dropped EXE 3 IoCs
pid Process 1948 lsass.exe 2000 Stlmn.exe 320 Stlmn.exe - Sets service image path in registry 2 TTPs
-
resource yara_rule behavioral1/memory/1844-2-0x0000000010000000-0x000000001003E000-memory.dmp upx behavioral1/memory/1948-5-0x0000000010000000-0x00000000101BA000-memory.dmp upx - Loads dropped DLL 1 IoCs
pid Process 2000 Stlmn.exe - Enumerates connected drives 3 TTPs 23 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\R: Stlmn.exe File opened (read-only) \??\L: Stlmn.exe File opened (read-only) \??\O: Stlmn.exe File opened (read-only) \??\S: Stlmn.exe File opened (read-only) \??\T: Stlmn.exe File opened (read-only) \??\W: Stlmn.exe File opened (read-only) \??\Y: Stlmn.exe File opened (read-only) \??\I: Stlmn.exe File opened (read-only) \??\E: Stlmn.exe File opened (read-only) \??\F: Stlmn.exe File opened (read-only) \??\G: Stlmn.exe File opened (read-only) \??\H: Stlmn.exe File opened (read-only) \??\J: Stlmn.exe File opened (read-only) \??\P: Stlmn.exe File opened (read-only) \??\Q: Stlmn.exe File opened (read-only) \??\B: Stlmn.exe File opened (read-only) \??\V: Stlmn.exe File opened (read-only) \??\X: Stlmn.exe File opened (read-only) \??\U: Stlmn.exe File opened (read-only) \??\M: Stlmn.exe File opened (read-only) \??\N: Stlmn.exe File opened (read-only) \??\Z: Stlmn.exe File opened (read-only) \??\K: Stlmn.exe - Drops file in System32 directory 2 IoCs
description ioc Process File created C:\Windows\SysWOW64\Stlmn.exe lsass.exe File opened for modification C:\Windows\SysWOW64\Stlmn.exe lsass.exe - Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\lsass.exe b05ef332fdb673343ef00b7d017fa637.exe File opened for modification C:\Windows\lsass.exe lsass.exe - Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 Stlmn.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz Stlmn.exe - Modifies data under HKEY_USERS 6 IoCs
description ioc Process Key created \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft Stlmn.exe Key created \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\ActiveMovie Stlmn.exe Key created \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\ActiveMovie\devenum Stlmn.exe Set value (int) \REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\ActiveMovie\devenum\Version = "7" Stlmn.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\ActiveMovie\devenum Stlmn.exe Key created \REGISTRY\USER\.DEFAULT\Software Stlmn.exe - Runs ping.exe 1 TTPs 1 IoCs
pid Process 1508 PING.EXE - Suspicious behavior: EnumeratesProcesses 66 IoCs
pid Process 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe 320 Stlmn.exe - Suspicious behavior: LoadsDriver 1 IoCs
pid Process 320 Stlmn.exe - Suspicious use of AdjustPrivilegeToken 6 IoCs
description pid Process Token: SeIncBasePriorityPrivilege 1948 lsass.exe Token: SeLoadDriverPrivilege 320 Stlmn.exe Token: 33 320 Stlmn.exe Token: SeIncBasePriorityPrivilege 320 Stlmn.exe Token: 33 320 Stlmn.exe Token: SeIncBasePriorityPrivilege 320 Stlmn.exe - Suspicious use of SetWindowsHookEx 3 IoCs
pid Process 1844 b05ef332fdb673343ef00b7d017fa637.exe 1844 b05ef332fdb673343ef00b7d017fa637.exe 1844 b05ef332fdb673343ef00b7d017fa637.exe - Suspicious use of WriteProcessMemory 22 IoCs
description pid Process procid_target PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1844 wrote to memory of 1948 1844 b05ef332fdb673343ef00b7d017fa637.exe 26 PID 1948 wrote to memory of 1352 1948 lsass.exe 28 PID 1948 wrote to memory of 1352 1948 lsass.exe 28 PID 1948 wrote to memory of 1352 1948 lsass.exe 28 PID 1948 wrote to memory of 1352 1948 lsass.exe 28 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 2000 wrote to memory of 320 2000 Stlmn.exe 30 PID 1352 wrote to memory of 1508 1352 cmd.exe 31 PID 1352 wrote to memory of 1508 1352 cmd.exe 31 PID 1352 wrote to memory of 1508 1352 cmd.exe 31 PID 1352 wrote to memory of 1508 1352 cmd.exe 31
Processes
-
C:\Users\Admin\AppData\Local\Temp\b05ef332fdb673343ef00b7d017fa637.exe"C:\Users\Admin\AppData\Local\Temp\b05ef332fdb673343ef00b7d017fa637.exe"1⤵
- Drops file in Windows directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1844 -
C:\Windows\lsass.exeC:\Windows\lsass.exe2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1948 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ping -n 2 127.0.0.1 > nul && del C:\Windows\lsass.exe > nul3⤵
- Suspicious use of WriteProcessMemory
PID:1352 -
C:\Windows\SysWOW64\PING.EXEping -n 2 127.0.0.14⤵
- Runs ping.exe
PID:1508
-
-
-
-
C:\Windows\SysWOW64\Stlmn.exeC:\Windows\SysWOW64\Stlmn.exe -auto1⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2000 -
C:\Windows\SysWOW64\Stlmn.exeC:\Windows\SysWOW64\Stlmn.exe -acsi2⤵
- Drops file in Drivers directory
- Executes dropped EXE
- Enumerates connected drives
- Checks processor information in registry
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: LoadsDriver
- Suspicious use of AdjustPrivilegeToken
PID:320
-