nymaim | c4bc7637d1aaf8456cbdb59cb58ae0711cd1430b99f339c658d150862e87ce96

Analysis

max time kernel
101s
max time network
132s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
17/12/2022, 11:16

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General

Target
file.exe
Size 2.3MB
Sample221217-nc5e4age86
SHA256 c4bc7637d1aaf8456cbdb59cb58ae0711cd1430b99f339c658d150862e87ce96
MD5 1d8d04218bcb750ce1d41abe11cf377e
SHA1 19ff38f525e8c427f0a200a0e5dc935c0c1ab1d9
SHA512 fc7d69bdea916ca6e96698b79b8469a2e95d7341943a032bae5b7a9acb70e3f003f203db824531970c7f0d93715f9578c1c03f7136ad9df50fcf303c22985aef
SSDEEP 49152:5f0E3I63p8BWykc3j1MDKqQ0LlKNN0EWtRZl9AnG2NRqETA+:5D313p8B13jieqJLlKQEWTZlhoEEd
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

45.139.105.171
85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
3492	is-IFSBH.tmp
3276	obFolders.exe
4904	PW9eMiO80jkWR7.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	obFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
3492	is-IFSBH.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-UR843.tmp	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-6IEK4.tmp	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-Q0O4P.tmp	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-D99OB.tmp	is-IFSBH.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\obFolders.exe	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QN0TB.tmp	is-IFSBH.tmp
File created	C:\Program Files (x86)\PrintFolders\is-173BH.tmp	is-IFSBH.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-IFSBH.tmp

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
2240	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3276	obFolders.exe
3276	obFolders.exe
3276	obFolders.exe
3276	obFolders.exe
3276	obFolders.exe
3276	obFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2240	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 3492	1260	file.exe	82
PID 1260 wrote to memory of 3492	1260	file.exe	82
PID 1260 wrote to memory of 3492	1260	file.exe	82
PID 3492 wrote to memory of 3276	3492	is-IFSBH.tmp	83
PID 3492 wrote to memory of 3276	3492	is-IFSBH.tmp	83
PID 3492 wrote to memory of 3276	3492	is-IFSBH.tmp	83
PID 3276 wrote to memory of 4904	3276	obFolders.exe	88
PID 3276 wrote to memory of 4904	3276	obFolders.exe	88
PID 3276 wrote to memory of 4904	3276	obFolders.exe	88
PID 3276 wrote to memory of 2184	3276	obFolders.exe	95
PID 3276 wrote to memory of 2184	3276	obFolders.exe	95
PID 3276 wrote to memory of 2184	3276	obFolders.exe	95
PID 2184 wrote to memory of 2240	2184	cmd.exe	97
PID 2184 wrote to memory of 2240	2184	cmd.exe	97
PID 2184 wrote to memory of 2240	2184	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1260
- C:\Users\Admin\AppData\Local\Temp\is-98LL7.tmp\is-IFSBH.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-98LL7.tmp\is-IFSBH.tmp" /SL4 $B0182 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2100628 169472
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3492
- - C:\Program Files (x86)\PrintFolders\obFolders.exe
    "C:\Program Files (x86)\PrintFolders\obFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:3276
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\PW9eMiO80jkWR7.exe
      4⤵
      Executes dropped EXE
      PID:4904
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "obFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\obFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2184
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "obFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2240

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.5MB
SHA256 76b35b195359800eec15dbdf0825e4d55be1579a44cfaa13ce9a6b4f7b39132f
MD5 ea09a5c8d0987f35278b5f5003f8b0bf
SHA1 52a43140df58e26cfcc41a1e716673a33a38a62d
SHA512 9fbffed13c547ea012de217507bff4bc81539bfebf22c556f0540c3a54397e88de6a504d73c05a1333904c4ac66f0c798d0e0a59a04b7134876331407181b0a8
SSDEEP 98304:Q83CREjE4Fff3DwPlY82kSWqpTwS119hqYExzcu:1ffz2
MD5 SHA1 SHA512 SSDEEP

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obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.5MB
SHA256 76b35b195359800eec15dbdf0825e4d55be1579a44cfaa13ce9a6b4f7b39132f
MD5 ea09a5c8d0987f35278b5f5003f8b0bf
SHA1 52a43140df58e26cfcc41a1e716673a33a38a62d
SHA512 9fbffed13c547ea012de217507bff4bc81539bfebf22c556f0540c3a54397e88de6a504d73c05a1333904c4ac66f0c798d0e0a59a04b7134876331407181b0a8
SSDEEP 98304:Q83CREjE4Fff3DwPlY82kSWqpTwS119hqYExzcu:1ffz2
MD5 SHA1 SHA512 SSDEEP

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is-IFSBH.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-98LL7.tmp\is-IFSBH.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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is-IFSBH.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-98LL7.tmp\is-IFSBH.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-B66TR.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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PW9eMiO80jkWR7.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\PW9eMiO80jkWR7.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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PW9eMiO80jkWR7.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\PW9eMiO80jkWR7.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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memory/1260-154-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/1260-137-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/1260-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3276-143-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/3276-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3276-151-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/3276-142-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/3276-153-0x0000000000400000-0x000000000158A000-memory.dmp

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