51b3773145652b5d559396a08e1282a3a1d92d4df473f774d61791386fca0598

Analysis

max time kernel
357s
max time network
359s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22-11-2024 03:09

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General

Target

Abrechnung.exe
Size

103KB
MD5

81ff324d2023d8ecb98a127b87d51450
SHA1

acd24c80f6a02f7fe7a388a6779ea49be64674bc
SHA256

7d9fc496bc0ade736bf75e05564e9c93167362ef18450d75222deef0664f9ed5
SHA512

38b17683e835e7259a6972d0f920f9ac7f5823591962c624aa795c39c3213d0735bacd76c72b7255be1cefeb9c298ffc31266513f088684969e5e18ad4e0a139
SSDEEP

1536:o7ZrIoIlP/A765noAXMoiCQ/5NSDy+Ud1IE9vpFARgHsjoCje6fLCy:odIp/A0noAcoiCQ/5NS6ERnECnfLCy

Score

8^/10

discovery evasion persistence upx

Malware Config

Signatures

Disables RegEdit via registry modification 1 IoCs

evasion

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2536 svchost.exe
Executes dropped EXE 2 IoCs

Processes:

mzfxiwlech.premzfxiwlech.pre

pid process

604 mzfxiwlech.pre
2724 mzfxiwlech.pre
Loads dropped DLL 3 IoCs

Processes:

svchost.exemzfxiwlech.pre

pid process

2536 svchost.exe
2536 svchost.exe
604 mzfxiwlech.pre

pid	process
2536	svchost.exe

pid	process
604	mzfxiwlech.pre
2724	mzfxiwlech.pre

pid	process
2536	svchost.exe
2536	svchost.exe
604	mzfxiwlech.pre

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\A5101B22 = "C:\\Users\\Admin\\AppData\\Roaming\\Klyizcnws\\730CD576A5101B224500.exe"	svchost.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

Abrechnung.exemzfxiwlech.pre

description	pid	process	target process
PID 2104 set thread context of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 604 set thread context of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre

UPX packed file 8 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2580-18-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-12-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-11-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-10-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-8-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-4-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2580-2-0x0000000000400000-0x0000000000417000-memory.dmp	upx
behavioral2/memory/2724-51-0x0000000000400000-0x0000000000417000-memory.dmp	upx

Drops file in Windows directory 3 IoCs

Processes:

DrvInst.exe

description	ioc	process
File opened for modification	C:\Windows\INF\setupapi.ev3	DrvInst.exe
File opened for modification	C:\Windows\INF\setupapi.ev1	DrvInst.exe
File opened for modification	C:\Windows\INF\setupapi.dev.log	DrvInst.exe

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

Processes:

svchost.exereg.exeAbrechnung.exeAbrechnung.exesvchost.exemzfxiwlech.premzfxiwlech.pre

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
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	mzfxiwlech.pre
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mzfxiwlech.pre

Modifies data under HKEY_USERS 43 IoCs

Processes:

DrvInst.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\CA\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Disallowed\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Root\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\trust\CTLs	DrvInst.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Classes\Local Settings\MuiCache\2D\52C64B7E\LanguageList = 65006e002d0055005300000065006e0000000000	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Root\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\SmartCardRoot\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\SmartCardRoot\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\TrustedPeople\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\TrustedPeople\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\My	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\CA\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\CA\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Disallowed\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\SmartCardRoot\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\trust\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\trust\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\CA\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\trust\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\TrustedPeople\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\trust\CRLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\CA\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\trust\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Policies\Microsoft\SystemCertificates\CA\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Disallowed\Certificates	DrvInst.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\SystemCertificates\Root\CTLs	DrvInst.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

Processes:

vssvc.exeDrvInst.exe

description	pid	process
Token: SeBackupPrivilege	2668	vssvc.exe
Token: SeRestorePrivilege	2668	vssvc.exe
Token: SeAuditPrivilege	2668	vssvc.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeRestorePrivilege	1752	DrvInst.exe
Token: SeLoadDriverPrivilege	1752	DrvInst.exe
Token: SeLoadDriverPrivilege	1752	DrvInst.exe
Token: SeLoadDriverPrivilege	1752	DrvInst.exe

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

Abrechnung.exeAbrechnung.exesvchost.exemzfxiwlech.premzfxiwlech.presvchost.exe

description	pid	process	target process
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2104 wrote to memory of 2580	2104	Abrechnung.exe	Abrechnung.exe
PID 2580 wrote to memory of 2536	2580	Abrechnung.exe	svchost.exe
PID 2580 wrote to memory of 2536	2580	Abrechnung.exe	svchost.exe
PID 2580 wrote to memory of 2536	2580	Abrechnung.exe	svchost.exe
PID 2580 wrote to memory of 2536	2580	Abrechnung.exe	svchost.exe
PID 2580 wrote to memory of 2536	2580	Abrechnung.exe	svchost.exe
PID 2536 wrote to memory of 604	2536	svchost.exe	mzfxiwlech.pre
PID 2536 wrote to memory of 604	2536	svchost.exe	mzfxiwlech.pre
PID 2536 wrote to memory of 604	2536	svchost.exe	mzfxiwlech.pre
PID 2536 wrote to memory of 604	2536	svchost.exe	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 604 wrote to memory of 2724	604	mzfxiwlech.pre	mzfxiwlech.pre
PID 2724 wrote to memory of 2468	2724	mzfxiwlech.pre	svchost.exe
PID 2724 wrote to memory of 2468	2724	mzfxiwlech.pre	svchost.exe
PID 2724 wrote to memory of 2468	2724	mzfxiwlech.pre	svchost.exe
PID 2724 wrote to memory of 2468	2724	mzfxiwlech.pre	svchost.exe
PID 2724 wrote to memory of 2468	2724	mzfxiwlech.pre	svchost.exe
PID 2468 wrote to memory of 2288	2468	svchost.exe	reg.exe
PID 2468 wrote to memory of 2288	2468	svchost.exe	reg.exe
PID 2468 wrote to memory of 2288	2468	svchost.exe	reg.exe
PID 2468 wrote to memory of 2288	2468	svchost.exe	reg.exe

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:2104
- 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:2580
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    - Deletes itself
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2536
  - - C:\Users\Admin\AppData\Local\Temp\mzfxiwlech.pre
      C:\Users\Admin\AppData\Local\Temp\mzfxiwlech.pre
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:604
    - - C:\Users\Admin\AppData\Local\Temp\mzfxiwlech.pre
        
        C:\Users\Admin\AppData\Local\Temp\mzfxiwlech.pre
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2724
      - 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:2468
        
        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:2288

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2668

C:\Windows\system32\DrvInst.exe
DrvInst.exe "1" "200" "STORAGE\VolumeSnapshot\HarddiskVolumeSnapshot19" "" "" "61530dda3" "0000000000000000" "00000000000005A8" "0000000000000498"
1⤵
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
PID:1752

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

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\mzfxiwlech.pre

Filesize
103KB

MD5
81ff324d2023d8ecb98a127b87d51450

SHA1
acd24c80f6a02f7fe7a388a6779ea49be64674bc

SHA256
7d9fc496bc0ade736bf75e05564e9c93167362ef18450d75222deef0664f9ed5

SHA512
38b17683e835e7259a6972d0f920f9ac7f5823591962c624aa795c39c3213d0735bacd76c72b7255be1cefeb9c298ffc31266513f088684969e5e18ad4e0a139

Download Submit
memory/604-41-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2104-13-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2468-57-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2468-53-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2468-52-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2468-48-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2536-15-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2536-14-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2536-21-0x000000007EF90000-0x000000007EFA1000-memory.dmp

Filesize
68KB

Download
memory/2580-11-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-4-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-2-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-6-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2580-10-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-12-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-0-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-18-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-8-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2580-19-0x0000000000411000-0x0000000000416000-memory.dmp

Filesize
20KB

Download
memory/2724-51-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download