buer | 94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886

Analysis

max time kernel
139s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
04-06-2024 22:58

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General

Target

96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe
Size

709KB
MD5

96878fda61a76395aafa16a6150b0fe1
SHA1

3509a916a873351ab23bc671cce5ca9aa3299e62
SHA256

94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886
SHA512

4e98e7b32441d270496b35c13e16ca0fedfca10e8baf8cb92a0a54fc803fb2bbfbc3417fe22467c195655821167d068a0ccde3310b45c75cada677ccea638234
SSDEEP

12288:skkB0IBUT4cicLtJAXqL2+uiN9mTqFcsTmjuHQdCgfRm:hkB0IB64cicLtJAXqL6qFrooQ+

Score

10^/10

buer execution loader persistence

Malware Config

Extracted

Family

buer

https://165.22.76.41/

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\\84324ab5ec21c00ef5e2\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4120-4-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/4120-8-0x0000000000730000-0x000000000073D000-memory.dmp	buer
behavioral2/memory/4120-0-0x0000000000740000-0x000000000074F000-memory.dmp	buer
behavioral2/memory/5060-17-0x0000000000750000-0x000000000075F000-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
4452	powershell.exe

Deletes itself 1 IoCs

pid	Process
5060	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
5060	gennt.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)	\??\M:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4452	powershell.exe
4452	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4452	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4120 wrote to memory of 5060	4120	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	96
PID 4120 wrote to memory of 5060	4120	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	96
PID 4120 wrote to memory of 5060	4120	96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe	96
PID 5060 wrote to memory of 4452	5060	gennt.exe	98
PID 5060 wrote to memory of 4452	5060	gennt.exe	98
PID 5060 wrote to memory of 4452	5060	gennt.exe	98

C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4120
- C:\ProgramData\84324ab5ec21c00ef5e2\gennt.exe
  C:\ProgramData\84324ab5ec21c00ef5e2\gennt.exe "C:\Users\Admin\AppData\Local\Temp\96878fda61a76395aafa16a6150b0fe1_JaffaCakes118.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:5060
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\84324ab5ec21c00ef5e2}"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4452

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\84324ab5ec21c00ef5e2\gennt.exe

Filesize
709KB

MD5
96878fda61a76395aafa16a6150b0fe1

SHA1
3509a916a873351ab23bc671cce5ca9aa3299e62

SHA256
94ba896b284005a58298806bba47f725cdcaa1816b3c79226639cb145bf16886

SHA512
4e98e7b32441d270496b35c13e16ca0fedfca10e8baf8cb92a0a54fc803fb2bbfbc3417fe22467c195655821167d068a0ccde3310b45c75cada677ccea638234

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xjlyimsc.mz1.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4120-8-0x0000000000730000-0x000000000073D000-memory.dmp

Filesize
52KB

Download
memory/4120-7-0x0000000000720000-0x0000000000721000-memory.dmp

Filesize
4KB

Download
memory/4120-0-0x0000000000740000-0x000000000074F000-memory.dmp

Filesize
60KB

Download
memory/4120-9-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/4120-15-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/4120-4-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/4452-44-0x0000000006100000-0x0000000006454000-memory.dmp

Filesize
3.3MB

Download
memory/4452-60-0x00000000077A0000-0x0000000007843000-memory.dmp

Filesize
652KB

Download
memory/4452-28-0x0000000002FC0000-0x0000000002FF6000-memory.dmp

Filesize
216KB

Download
memory/4452-30-0x0000000005780000-0x0000000005DA8000-memory.dmp

Filesize
6.2MB

Download
memory/4452-29-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-31-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-32-0x0000000005600000-0x0000000005622000-memory.dmp

Filesize
136KB

Download
memory/4452-33-0x0000000005F20000-0x0000000005F86000-memory.dmp

Filesize
408KB

Download
memory/4452-34-0x0000000005F90000-0x0000000005FF6000-memory.dmp

Filesize
408KB

Download
memory/4452-74-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-68-0x0000000007B00000-0x0000000007B0E000-memory.dmp

Filesize
56KB

Download
memory/4452-45-0x00000000065A0000-0x00000000065BE000-memory.dmp

Filesize
120KB

Download
memory/4452-46-0x00000000065F0000-0x000000000663C000-memory.dmp

Filesize
304KB

Download
memory/4452-47-0x0000000006B70000-0x0000000006BA2000-memory.dmp

Filesize
200KB

Download
memory/4452-59-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-27-0x00000000748AE000-0x00000000748AF000-memory.dmp

Filesize
4KB

Download
memory/4452-61-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-58-0x0000000006BB0000-0x0000000006BCE000-memory.dmp

Filesize
120KB

Download
memory/4452-48-0x0000000070740000-0x000000007078C000-memory.dmp

Filesize
304KB

Download
memory/4452-62-0x00000000748A0000-0x0000000075050000-memory.dmp

Filesize
7.7MB

Download
memory/4452-63-0x0000000007F10000-0x000000000858A000-memory.dmp

Filesize
6.5MB

Download
memory/4452-64-0x00000000078D0000-0x00000000078EA000-memory.dmp

Filesize
104KB

Download
memory/4452-65-0x0000000007940000-0x000000000794A000-memory.dmp

Filesize
40KB

Download
memory/4452-66-0x0000000007B50000-0x0000000007BE6000-memory.dmp

Filesize
600KB

Download
memory/4452-67-0x0000000007AD0000-0x0000000007AE1000-memory.dmp

Filesize
68KB

Download
memory/4452-69-0x0000000007B10000-0x0000000007B24000-memory.dmp

Filesize
80KB

Download
memory/4452-71-0x0000000007BF0000-0x0000000007BF8000-memory.dmp

Filesize
32KB

Download
memory/4452-70-0x0000000007C10000-0x0000000007C2A000-memory.dmp

Filesize
104KB

Download
memory/5060-17-0x0000000000750000-0x000000000075F000-memory.dmp

Filesize
60KB

Download
memory/5060-24-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/5060-81-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download