buer | 3d994a2f80a63f31bf56ddded5ed35f020c40c0324b3ab1935e08b15c25ba017

General

Target
fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
Size 239KB
Sample240927-jqbbysvfpg
SHA256 3d994a2f80a63f31bf56ddded5ed35f020c40c0324b3ab1935e08b15c25ba017
MD5 fa0322fb70610d6e67585588184eda39
SHA1 7bf793587550abbc8a39d5cb26b1328483b17820
SHA512 6615bd7060022ab8e6e36160955f1e09d6800dbe509b85aafb738f890c54c1568cbbfbd77451a55bdefc42dd2c1ad899d78ef4022a8cdcfadcd2d1b3f0baa56b
SSDEEP 6144:jh0jAkZaisNF2VZkltu4U6QsJFe88CGSzyTLNje:qckZaHD2stu4UfsJiCGSzuNje
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

buer discovery execution loader

Malware Config

Extracted

Family

buer

C2

https://104.248.83.13/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2832-0-0x0000000000250000-0x000000000025F000-memory.dmp	buer
behavioral1/memory/2832-4-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/2832-7-0x0000000000230000-0x000000000023D000-memory.dmp	buer

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2892	powershell.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\V:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\Z:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\I:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\J:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\L:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\W:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\E:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\K:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\M:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\Q:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\R:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\B:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\N:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\P:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\O:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\S:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\T:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\U:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\X:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\A:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\G:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\H:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
File opened (read-only)	\??\Y:	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2892	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2892	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2832 wrote to memory of 2892	2832	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe	31
PID 2832 wrote to memory of 2892	2832	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe	31
PID 2832 wrote to memory of 2892	2832	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe	31
PID 2832 wrote to memory of 2892	2832	fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe	31

C:\Users\Admin\AppData\Local\Temp\fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\fa0322fb70610d6e67585588184eda39_JaffaCakes118.exe"
1⤵
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2832
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\d15091db3d5c67602891}"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2892