d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0

Analysis

max time kernel
150s
max time network
124s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
26/07/2024, 03:56

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General

Target

d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe
Size

484KB
MD5

7a075d0b2c92fd6ba552e818e1ab9c9d
SHA1

a2dae3f9b5529e663ac7e43cad281ef550760a6a
SHA256

d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0
SHA512

f30a1e77eeedfbdf08787f2422afb28a54d195dd429b36c54a6cc62ab7a1b8204010442a84483d65317b0fa10dfffead7a9a1fe8cb605f409b9b7d5da9a269b8
SSDEEP

12288:GLPkCDt1EG2XVekhdeTlKKbob6MwE/X+Iwyr:GLPkQ1bqAdxMw+hwY

Score

7^/10

discovery persistence

Malware Config

Signatures

Executes dropped EXE 3 IoCs

pid	Process
2712	dcomubst.exe
2768	~754F.tmp
2336	calcetsh.exe

Loads dropped DLL 3 IoCs

pid	Process
2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe
2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe
2712	dcomubst.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940600906-3464502421-4240639183-1000\Software\Microsoft\Windows\CurrentVersion\Run\AtBrokup = "C:\\Users\\Admin\\AppData\\Roaming\\RMAcerpt\\dcomubst.exe"	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\calcetsh.exe	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1936	2932	WerFault.exe	29

System Location Discovery: System Language Discovery 1 TTPs 3 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	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dcomubst.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	calcetsh.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2712	dcomubst.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE
2336	calcetsh.exe
1236	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2712	dcomubst.exe
Token: SeShutdownPrivilege	1236	Explorer.EXE

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 2712	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	30
PID 2932 wrote to memory of 2712	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	30
PID 2932 wrote to memory of 2712	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	30
PID 2932 wrote to memory of 2712	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	30
PID 2712 wrote to memory of 2768	2712	dcomubst.exe	31
PID 2712 wrote to memory of 2768	2712	dcomubst.exe	31
PID 2712 wrote to memory of 2768	2712	dcomubst.exe	31
PID 2712 wrote to memory of 2768	2712	dcomubst.exe	31
PID 2768 wrote to memory of 1236	2768	~754F.tmp	21
PID 2932 wrote to memory of 1936	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	33
PID 2932 wrote to memory of 1936	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	33
PID 2932 wrote to memory of 1936	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	33
PID 2932 wrote to memory of 1936	2932	d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe	33

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1236
- C:\Users\Admin\AppData\Local\Temp\d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe
  "C:\Users\Admin\AppData\Local\Temp\d4e8cb8331e8473a3918ac51534ae8c5ecd9c28534e8bd9c8eb96f76162cf2d0.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2932
- - C:\Users\Admin\AppData\Roaming\RMAcerpt\dcomubst.exe
    "C:\Users\Admin\AppData\Roaming\RMAcerpt"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2712
  - - C:\Users\Admin\AppData\Local\Temp\~754F.tmp
      1236 496136 2712 1
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:2768
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2932 -s 252
    3⤵
    - Program crash
    PID:1936

C:\Windows\SysWOW64\calcetsh.exe
C:\Windows\SysWOW64\calcetsh.exe -s
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:2336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\~754F.tmp

Filesize
8KB

MD5
aac3165ece2959f39ff98334618d10d9

SHA1
020a191bfdc70c1fbd3bf74cd7479258bd197f51

SHA256
96fa6a7714670823c83099ea01d24d6d3ae8fef027f01a4ddac14f123b1c9974

SHA512
9eb876812a6a13dd4b090788c2b1d9e9a2e25370598ed5c040f82e6f378edc4b78d58bc8f60d5a559ea57b1edcf3a144bfe09454a9928997173db8279d5b40cf

Download Submit
\Users\Admin\AppData\Roaming\RMAcerpt\dcomubst.exe

Filesize
484KB

MD5
7bbe89c16d0b6a9b6b1d02cf8d6de585

SHA1
b57d66c533d56cdb141ffa9edf2580fd3eb9a557

SHA256
db8bf6f534feb3044c5aa99d2fec5dc45befcbcb59df4a9cd33e05c888a45aee

SHA512
d85b1c77c473f552702317bbddda9120187751f05b48658c91698ddd33422f5e0ba4003afeca92877cd11886c44189a090fc041f9fb896dfbd7ba57551477447

Download Submit
memory/1236-21-0x0000000003F60000-0x0000000003FE9000-memory.dmp

Filesize
548KB

Download
memory/1236-32-0x0000000002DE0000-0x0000000002DE6000-memory.dmp

Filesize
24KB

Download
memory/1236-33-0x0000000002E00000-0x0000000002E0D000-memory.dmp

Filesize
52KB

Download
memory/1236-18-0x0000000003F60000-0x0000000003FE9000-memory.dmp

Filesize
548KB

Download
memory/1236-17-0x0000000003F60000-0x0000000003FE9000-memory.dmp

Filesize
548KB

Download
memory/2336-34-0x0000000000090000-0x0000000000096000-memory.dmp

Filesize
24KB

Download
memory/2336-25-0x0000000000080000-0x0000000000086000-memory.dmp

Filesize
24KB

Download
memory/2336-24-0x0000000000210000-0x0000000000293000-memory.dmp

Filesize
524KB

Download
memory/2336-35-0x0000000000080000-0x0000000000086000-memory.dmp

Filesize
24KB

Download
memory/2336-37-0x0000000000080000-0x0000000000086000-memory.dmp

Filesize
24KB

Download
memory/2712-12-0x0000000000120000-0x00000000001A3000-memory.dmp

Filesize
524KB

Download
memory/2712-13-0x00000000001D0000-0x00000000001D6000-memory.dmp

Filesize
24KB

Download
memory/2932-0-0x0000000000270000-0x00000000002F3000-memory.dmp

Filesize
524KB

Download
memory/2932-36-0x0000000000270000-0x00000000002F3000-memory.dmp

Filesize
524KB

Download