buer | 54b7bba0fc0b998427ddd65c88fc8d5d5afe20304d043cd2831c6ca646bce0b0

General

Target

tmp.exe
Size

120KB
MD5

5c509d1af9a1e914c2f44f725b391afb
SHA1

e53a38c381e40a02867d280a7363e8becca5a6c3
SHA256

44e5ab9cd8b8c02f5c28871cb59c5beb1106e4159e5d4b6aa591335e1b4c6b2f
SHA512

60dc5a4ac44dcc6ad5610c1358afd0d3c01d40d6ffce76b61034212c3c1d557ef91d76f756ceccc44dea7c7d00441296b6aa240954f40100dfecaa1aa95fcfe8
SSDEEP

3072:G2A3MDSSCijJr/w0WGuTRGQaPgr5eBJoB2hNUMhTKJ:G2A8BrRuTRzeKMFKJ

Score

10^/10

buer discovery loader persistence

Malware Config

Extracted

Family

buer

C2

https://eternitydev.me/

https://masonkhonsari.me/

Signatures

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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\caf6f952e000f07af36b\\gennt.exe\""	gennt.exe

Buer Loader 8 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral5/memory/2404-0-0x0000000000020000-0x000000000002A000-memory.dmp	buer
behavioral5/memory/2404-1-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral5/memory/2404-2-0x0000000000020000-0x000000000002A000-memory.dmp	buer
behavioral5/memory/2404-3-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral5/memory/2404-12-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral5/memory/2052-13-0x0000000000020000-0x000000000002A000-memory.dmp	buer
behavioral5/memory/2052-14-0x0000000000030000-0x000000000003C000-memory.dmp	buer
behavioral5/memory/2052-16-0x0000000000030000-0x000000000003C000-memory.dmp	buer

Deletes itself 1 IoCs

pid	Process
2052	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
2052	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
2404	tmp.exe
2404	tmp.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:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 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	tmp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gennt.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	secinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2052	gennt.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2404 wrote to memory of 2052	2404	tmp.exe	30
PID 2404 wrote to memory of 2052	2404	tmp.exe	30
PID 2404 wrote to memory of 2052	2404	tmp.exe	30
PID 2404 wrote to memory of 2052	2404	tmp.exe	30
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 2612	2052	gennt.exe	31
PID 2052 wrote to memory of 1608	2052	gennt.exe	32
PID 2052 wrote to memory of 1608	2052	gennt.exe	32
PID 2052 wrote to memory of 1608	2052	gennt.exe	32
PID 2052 wrote to memory of 1608	2052	gennt.exe	32

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2404
- C:\ProgramData\caf6f952e000f07af36b\gennt.exe
  C:\ProgramData\caf6f952e000f07af36b\gennt.exe "C:\Users\Admin\AppData\Local\Temp\tmp.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2052
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\caf6f952e000f07af36b\gennt.exe
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2612
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\caf6f952e000f07af36b}"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1608

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\ProgramData\caf6f952e000f07af36b\gennt.exe

Filesize
120KB

MD5
5c509d1af9a1e914c2f44f725b391afb

SHA1
e53a38c381e40a02867d280a7363e8becca5a6c3

SHA256
44e5ab9cd8b8c02f5c28871cb59c5beb1106e4159e5d4b6aa591335e1b4c6b2f

SHA512
60dc5a4ac44dcc6ad5610c1358afd0d3c01d40d6ffce76b61034212c3c1d557ef91d76f756ceccc44dea7c7d00441296b6aa240954f40100dfecaa1aa95fcfe8

Download Submit
memory/2052-16-0x0000000000030000-0x000000000003C000-memory.dmp

Filesize
48KB

Download
memory/2052-13-0x0000000000020000-0x000000000002A000-memory.dmp

Filesize
40KB

Download
memory/2052-31-0x0000000000880000-0x00000000008A1000-memory.dmp

Filesize
132KB

Download
memory/2052-14-0x0000000000030000-0x000000000003C000-memory.dmp

Filesize
48KB

Download
memory/2404-3-0x0000000000030000-0x000000000003C000-memory.dmp

Filesize
48KB

Download
memory/2404-2-0x0000000000020000-0x000000000002A000-memory.dmp

Filesize
40KB

Download
memory/2404-12-0x0000000000030000-0x000000000003C000-memory.dmp

Filesize
48KB

Download
memory/2404-0-0x0000000000020000-0x000000000002A000-memory.dmp

Filesize
40KB

Download
memory/2404-1-0x0000000000030000-0x000000000003C000-memory.dmp

Filesize
48KB

Download
memory/2612-25-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/2612-29-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/2612-27-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/2612-23-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download
memory/2612-22-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download
memory/2612-21-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download
memory/2612-19-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download
memory/2612-30-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download
memory/2612-17-0x00000000000D0000-0x00000000000F1000-memory.dmp

Filesize
132KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads