buer | db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

General

Target

Print.exe
Size

336KB
MD5

987e0fb2e2e25e7587fc73ad83dcd096
SHA1

8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665
SHA256

db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea
SHA512

41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a
SSDEEP

6144:1FyuHrjLvBSC+ct43OGIKRvpjkpluW2TKTBBzHF:pSChGIevpjT8fB

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://165.232.118.210/

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\\49d5d79d388f5817d3a8\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/744-0-0x00000000001E0000-0x00000000001EF000-memory.dmp	buer
behavioral1/memory/744-1-0x00000000001D0000-0x00000000001DD000-memory.dmp	buer
behavioral1/memory/744-5-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/2912-17-0x0000000000320000-0x000000000032F000-memory.dmp	buer

Deletes itself 1 IoCs

pid	Process
2912	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
2912	gennt.exe

Loads dropped DLL 2 IoCs

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

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2944	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2944	powershell.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
744	Print.exe
2912	gennt.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 744 wrote to memory of 2912	744	Print.exe	30
PID 744 wrote to memory of 2912	744	Print.exe	30
PID 744 wrote to memory of 2912	744	Print.exe	30
PID 744 wrote to memory of 2912	744	Print.exe	30
PID 2912 wrote to memory of 2944	2912	gennt.exe	31
PID 2912 wrote to memory of 2944	2912	gennt.exe	31
PID 2912 wrote to memory of 2944	2912	gennt.exe	31
PID 2912 wrote to memory of 2944	2912	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\Print.exe
"C:\Users\Admin\AppData\Local\Temp\Print.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:744
- C:\ProgramData\49d5d79d388f5817d3a8\gennt.exe
  C:\ProgramData\49d5d79d388f5817d3a8\gennt.exe "C:\Users\Admin\AppData\Local\Temp\Print.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2912
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\49d5d79d388f5817d3a8}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2944

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

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\49d5d79d388f5817d3a8\gennt.exe

Filesize
336KB

MD5
987e0fb2e2e25e7587fc73ad83dcd096

SHA1
8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665

SHA256
db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

SHA512
41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a

Download Submit
C:\ProgramData\49d5d79d388f5817d3a8\gennt.exe

Filesize
336KB

MD5
987e0fb2e2e25e7587fc73ad83dcd096

SHA1
8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665

SHA256
db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

SHA512
41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a

Download Submit
C:\ProgramData\49d5d79d388f5817d3a8\gennt.exe

Filesize
336KB

MD5
987e0fb2e2e25e7587fc73ad83dcd096

SHA1
8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665

SHA256
db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

SHA512
41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a

Download Submit
\ProgramData\49d5d79d388f5817d3a8\gennt.exe

Filesize
336KB

MD5
987e0fb2e2e25e7587fc73ad83dcd096

SHA1
8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665

SHA256
db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

SHA512
41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a

Download Submit
\ProgramData\49d5d79d388f5817d3a8\gennt.exe

Filesize
336KB

MD5
987e0fb2e2e25e7587fc73ad83dcd096

SHA1
8f84cdc64ff17e23cbc4f61cd37e3f7f4ec1b665

SHA256
db601f84fd39ba6be26e7a6c0cc1a74da424698244d9a1861b2f9fb980ab7dea

SHA512
41e544df2e12e0b195daab9ce2dce50d7067dca5f770950667ff3ca7aa2dfc4db4366528abeaccbb7712b8c24cc1f58eb73a2f0bd0852b586b8ba335e44ed37a

Download Submit
memory/744-0-0x00000000001E0000-0x00000000001EF000-memory.dmp

Filesize
60KB

Download
memory/744-5-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/744-1-0x00000000001D0000-0x00000000001DD000-memory.dmp

Filesize
52KB

Download
memory/2912-17-0x0000000000320000-0x000000000032F000-memory.dmp

Filesize
60KB

Download
memory/2944-26-0x0000000074480000-0x0000000074A2B000-memory.dmp

Filesize
5.7MB

Download
memory/2944-27-0x0000000074480000-0x0000000074A2B000-memory.dmp

Filesize
5.7MB

Download
memory/2944-28-0x0000000002730000-0x0000000002770000-memory.dmp

Filesize
256KB

Download
memory/2944-29-0x0000000002730000-0x0000000002770000-memory.dmp

Filesize
256KB

Download
memory/2944-30-0x0000000002730000-0x0000000002770000-memory.dmp

Filesize
256KB

Download
memory/2944-31-0x0000000074480000-0x0000000074A2B000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads