51b3773145652b5d559396a08e1282a3a1d92d4df473f774d61791386fca0598

Analysis

max time kernel
93s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22/11/2024, 03:27

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General

Target
Abrechnung.exe
Size 103KB
Sample241122-dz7tmazlan
SHA256 7d9fc496bc0ade736bf75e05564e9c93167362ef18450d75222deef0664f9ed5
MD5 81ff324d2023d8ecb98a127b87d51450
SHA1 acd24c80f6a02f7fe7a388a6779ea49be64674bc
SHA512 38b17683e835e7259a6972d0f920f9ac7f5823591962c624aa795c39c3213d0735bacd76c72b7255be1cefeb9c298ffc31266513f088684969e5e18ad4e0a139
SSDEEP 1536:o7ZrIoIlP/A765noAXMoiCQ/5NSDy+Ud1IE9vpFARgHsjoCje6fLCy:odIp/A0noAcoiCQ/5NS6ERnECnfLCy
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

discovery evasion persistence upx

Malware Config

Signatures

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	svchost.exe

Deletes itself 1 IoCs

pid	Process
3236	svchost.exe

Executes dropped EXE 2 IoCs

pid	Process
2208	mzynnwlfui.pre
3092	mzynnwlfui.pre

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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\59A5B1E1 = "C:\\Users\\Admin\\AppData\\Roaming\\Qpxgoefvja\\988260A059A5B1E11BA7.exe"	svchost.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2580 set thread context of 1792	2580	Abrechnung.exe	83
PID 2208 set thread context of 3092	2208	mzynnwlfui.pre	94

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral4/memory/1792-0-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral4/memory/1792-4-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral4/memory/1792-5-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral4/memory/1792-3-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral4/memory/3092-22-0x0000000000400000-0x0000000000417000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 7 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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Abrechnung.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Abrechnung.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mzynnwlfui.pre
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mzynnwlfui.pre
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Checks SCSI registry key(s) 3 TTPs 5 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr\PartitionTableCache = 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	vssvc.exe
Set value (data)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr\SnapshotDataCache = 534e41505041525401000000700000008ec7416a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	vssvc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters	vssvc.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Device Parameters\Partmgr	vssvc.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeBackupPrivilege	4992	vssvc.exe
Token: SeRestorePrivilege	4992	vssvc.exe
Token: SeAuditPrivilege	4992	vssvc.exe
Token: SeBackupPrivilege	636	srtasks.exe
Token: SeRestorePrivilege	636	srtasks.exe
Token: SeSecurityPrivilege	636	srtasks.exe
Token: SeTakeOwnershipPrivilege	636	srtasks.exe
Token: SeBackupPrivilege	636	srtasks.exe
Token: SeRestorePrivilege	636	srtasks.exe
Token: SeSecurityPrivilege	636	srtasks.exe
Token: SeTakeOwnershipPrivilege	636	srtasks.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 2580 wrote to memory of 1792	2580	Abrechnung.exe	83
PID 1792 wrote to memory of 3236	1792	Abrechnung.exe	84
PID 1792 wrote to memory of 3236	1792	Abrechnung.exe	84
PID 1792 wrote to memory of 3236	1792	Abrechnung.exe	84
PID 1792 wrote to memory of 3236	1792	Abrechnung.exe	84
PID 3236 wrote to memory of 2208	3236	svchost.exe	93
PID 3236 wrote to memory of 2208	3236	svchost.exe	93
PID 3236 wrote to memory of 2208	3236	svchost.exe	93
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 2208 wrote to memory of 3092	2208	mzynnwlfui.pre	94
PID 3092 wrote to memory of 1452	3092	mzynnwlfui.pre	95
PID 3092 wrote to memory of 1452	3092	mzynnwlfui.pre	95
PID 3092 wrote to memory of 1452	3092	mzynnwlfui.pre	95
PID 3092 wrote to memory of 1452	3092	mzynnwlfui.pre	95
PID 1452 wrote to memory of 4668	1452	svchost.exe	102
PID 1452 wrote to memory of 4668	1452	svchost.exe	102
PID 1452 wrote to memory of 4668	1452	svchost.exe	102

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\Abrechnung.exe
"C:\Users\Admin\AppData\Local\Temp\Abrechnung.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2580
- C:\Users\Admin\AppData\Local\Temp\Abrechnung.exe
  C:\Users\Admin\AppData\Local\Temp\Abrechnung.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1792
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    - Deletes itself
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3236
  - - C:\Users\Admin\AppData\Local\Temp\mzynnwlfui.pre
      C:\Users\Admin\AppData\Local\Temp\mzynnwlfui.pre
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2208
    - - C:\Users\Admin\AppData\Local\Temp\mzynnwlfui.pre
        
        C:\Users\Admin\AppData\Local\Temp\mzynnwlfui.pre
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:3092
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        Disables RegEdit via registry modification
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:1452
        
        C:\Windows\SysWOW64\reg.exe
        
        reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System"
        7⤵
        System Location Discovery: System Language Discovery
        
        PID:4668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Checks SCSI registry key(s)
- Suspicious use of AdjustPrivilegeToken
PID:4992

C:\Windows\system32\srtasks.exe
C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:636

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

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mzynnwlfui.pre

Path C:\Users\Admin\AppData\Local\Temp\mzynnwlfui.pre
Size 103KB
SHA256 7d9fc496bc0ade736bf75e05564e9c93167362ef18450d75222deef0664f9ed5
MD5 81ff324d2023d8ecb98a127b87d51450
SHA1 acd24c80f6a02f7fe7a388a6779ea49be64674bc
SHA512 38b17683e835e7259a6972d0f920f9ac7f5823591962c624aa795c39c3213d0735bacd76c72b7255be1cefeb9c298ffc31266513f088684969e5e18ad4e0a139
SSDEEP 1536:o7ZrIoIlP/A765noAXMoiCQ/5NSDy+Ud1IE9vpFARgHsjoCje6fLCy:odIp/A0noAcoiCQ/5NS6ERnECnfLCy
MD5 SHA1 SHA512 SSDEEP

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memory/1452-20-0x000000007F6E0000-0x000000007F6F1000-memory.dmp

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memory/1452-24-0x000000007F6E0000-0x000000007F6F1000-memory.dmp

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memory/1452-25-0x000000007F6E0000-0x000000007F6F1000-memory.dmp

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memory/1452-29-0x000000007F6E0000-0x000000007F6F1000-memory.dmp

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memory/1792-4-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/1792-5-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/1792-3-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/1792-0-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2208-16-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/2580-1-0x0000000000400000-0x0000000000421000-memory.dmp

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memory/3092-22-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3236-6-0x000000007FC90000-0x000000007FCA1000-memory.dmp

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memory/3236-12-0x000000007FC90000-0x000000007FCA1000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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